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2009-06-17 H.J. Lu <hongjiu.lu@intel.com>
[binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31
32 /* 386 uses REL relocations instead of RELA. */
33 #define USE_REL 1
34
35 #include "elf/i386.h"
36
37 static reloc_howto_type elf_howto_table[]=
38 {
39 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
40 bfd_elf_generic_reloc, "R_386_NONE",
41 TRUE, 0x00000000, 0x00000000, FALSE),
42 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
43 bfd_elf_generic_reloc, "R_386_32",
44 TRUE, 0xffffffff, 0xffffffff, FALSE),
45 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_386_PC32",
47 TRUE, 0xffffffff, 0xffffffff, TRUE),
48 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
49 bfd_elf_generic_reloc, "R_386_GOT32",
50 TRUE, 0xffffffff, 0xffffffff, FALSE),
51 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_386_PLT32",
53 TRUE, 0xffffffff, 0xffffffff, TRUE),
54 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
55 bfd_elf_generic_reloc, "R_386_COPY",
56 TRUE, 0xffffffff, 0xffffffff, FALSE),
57 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
59 TRUE, 0xffffffff, 0xffffffff, FALSE),
60 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
62 TRUE, 0xffffffff, 0xffffffff, FALSE),
63 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_386_RELATIVE",
65 TRUE, 0xffffffff, 0xffffffff, FALSE),
66 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_386_GOTOFF",
68 TRUE, 0xffffffff, 0xffffffff, FALSE),
69 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_386_GOTPC",
71 TRUE, 0xffffffff, 0xffffffff, TRUE),
72
73 /* We have a gap in the reloc numbers here.
74 R_386_standard counts the number up to this point, and
75 R_386_ext_offset is the value to subtract from a reloc type of
76 R_386_16 thru R_386_PC8 to form an index into this table. */
77 #define R_386_standard (R_386_GOTPC + 1)
78 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
79
80 /* These relocs are a GNU extension. */
81 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
83 TRUE, 0xffffffff, 0xffffffff, FALSE),
84 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_386_TLS_IE",
86 TRUE, 0xffffffff, 0xffffffff, FALSE),
87 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
89 TRUE, 0xffffffff, 0xffffffff, FALSE),
90 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_386_TLS_LE",
92 TRUE, 0xffffffff, 0xffffffff, FALSE),
93 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_TLS_GD",
95 TRUE, 0xffffffff, 0xffffffff, FALSE),
96 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_TLS_LDM",
98 TRUE, 0xffffffff, 0xffffffff, FALSE),
99 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_16",
101 TRUE, 0xffff, 0xffff, FALSE),
102 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_386_PC16",
104 TRUE, 0xffff, 0xffff, TRUE),
105 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_386_8",
107 TRUE, 0xff, 0xff, FALSE),
108 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
109 bfd_elf_generic_reloc, "R_386_PC8",
110 TRUE, 0xff, 0xff, TRUE),
111
112 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
113 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
114 /* These are common with Solaris TLS implementation. */
115 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
117 TRUE, 0xffffffff, 0xffffffff, FALSE),
118 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
120 TRUE, 0xffffffff, 0xffffffff, FALSE),
121 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
123 TRUE, 0xffffffff, 0xffffffff, FALSE),
124 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
126 TRUE, 0xffffffff, 0xffffffff, FALSE),
127 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
129 TRUE, 0xffffffff, 0xffffffff, FALSE),
130 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
132 TRUE, 0xffffffff, 0xffffffff, FALSE),
133 EMPTY_HOWTO (38),
134 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
136 TRUE, 0xffffffff, 0xffffffff, FALSE),
137 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
138 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
139 FALSE, 0, 0, FALSE),
140 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_386_TLS_DESC",
142 TRUE, 0xffffffff, 0xffffffff, FALSE),
143 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_IRELATIVE",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146
147 /* Another gap. */
148 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
150
151 /* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT, /* type */
153 0, /* rightshift */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
155 0, /* bitsize */
156 FALSE, /* pc_relative */
157 0, /* bitpos */
158 complain_overflow_dont, /* complain_on_overflow */
159 NULL, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE, /* partial_inplace */
162 0, /* src_mask */
163 0, /* dst_mask */
164 FALSE), /* pcrel_offset */
165
166 /* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY, /* type */
168 0, /* rightshift */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
170 0, /* bitsize */
171 FALSE, /* pc_relative */
172 0, /* bitpos */
173 complain_overflow_dont, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE, /* partial_inplace */
177 0, /* src_mask */
178 0, /* dst_mask */
179 FALSE) /* pcrel_offset */
180
181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
182
183 };
184
185 #ifdef DEBUG_GEN_RELOC
186 #define TRACE(str) \
187 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
188 #else
189 #define TRACE(str)
190 #endif
191
192 static reloc_howto_type *
193 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
194 bfd_reloc_code_real_type code)
195 {
196 switch (code)
197 {
198 case BFD_RELOC_NONE:
199 TRACE ("BFD_RELOC_NONE");
200 return &elf_howto_table[R_386_NONE];
201
202 case BFD_RELOC_32:
203 TRACE ("BFD_RELOC_32");
204 return &elf_howto_table[R_386_32];
205
206 case BFD_RELOC_CTOR:
207 TRACE ("BFD_RELOC_CTOR");
208 return &elf_howto_table[R_386_32];
209
210 case BFD_RELOC_32_PCREL:
211 TRACE ("BFD_RELOC_PC32");
212 return &elf_howto_table[R_386_PC32];
213
214 case BFD_RELOC_386_GOT32:
215 TRACE ("BFD_RELOC_386_GOT32");
216 return &elf_howto_table[R_386_GOT32];
217
218 case BFD_RELOC_386_PLT32:
219 TRACE ("BFD_RELOC_386_PLT32");
220 return &elf_howto_table[R_386_PLT32];
221
222 case BFD_RELOC_386_COPY:
223 TRACE ("BFD_RELOC_386_COPY");
224 return &elf_howto_table[R_386_COPY];
225
226 case BFD_RELOC_386_GLOB_DAT:
227 TRACE ("BFD_RELOC_386_GLOB_DAT");
228 return &elf_howto_table[R_386_GLOB_DAT];
229
230 case BFD_RELOC_386_JUMP_SLOT:
231 TRACE ("BFD_RELOC_386_JUMP_SLOT");
232 return &elf_howto_table[R_386_JUMP_SLOT];
233
234 case BFD_RELOC_386_RELATIVE:
235 TRACE ("BFD_RELOC_386_RELATIVE");
236 return &elf_howto_table[R_386_RELATIVE];
237
238 case BFD_RELOC_386_GOTOFF:
239 TRACE ("BFD_RELOC_386_GOTOFF");
240 return &elf_howto_table[R_386_GOTOFF];
241
242 case BFD_RELOC_386_GOTPC:
243 TRACE ("BFD_RELOC_386_GOTPC");
244 return &elf_howto_table[R_386_GOTPC];
245
246 /* These relocs are a GNU extension. */
247 case BFD_RELOC_386_TLS_TPOFF:
248 TRACE ("BFD_RELOC_386_TLS_TPOFF");
249 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
250
251 case BFD_RELOC_386_TLS_IE:
252 TRACE ("BFD_RELOC_386_TLS_IE");
253 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
254
255 case BFD_RELOC_386_TLS_GOTIE:
256 TRACE ("BFD_RELOC_386_TLS_GOTIE");
257 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
258
259 case BFD_RELOC_386_TLS_LE:
260 TRACE ("BFD_RELOC_386_TLS_LE");
261 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
262
263 case BFD_RELOC_386_TLS_GD:
264 TRACE ("BFD_RELOC_386_TLS_GD");
265 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
266
267 case BFD_RELOC_386_TLS_LDM:
268 TRACE ("BFD_RELOC_386_TLS_LDM");
269 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
270
271 case BFD_RELOC_16:
272 TRACE ("BFD_RELOC_16");
273 return &elf_howto_table[R_386_16 - R_386_ext_offset];
274
275 case BFD_RELOC_16_PCREL:
276 TRACE ("BFD_RELOC_16_PCREL");
277 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
278
279 case BFD_RELOC_8:
280 TRACE ("BFD_RELOC_8");
281 return &elf_howto_table[R_386_8 - R_386_ext_offset];
282
283 case BFD_RELOC_8_PCREL:
284 TRACE ("BFD_RELOC_8_PCREL");
285 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
286
287 /* Common with Sun TLS implementation. */
288 case BFD_RELOC_386_TLS_LDO_32:
289 TRACE ("BFD_RELOC_386_TLS_LDO_32");
290 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
291
292 case BFD_RELOC_386_TLS_IE_32:
293 TRACE ("BFD_RELOC_386_TLS_IE_32");
294 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
295
296 case BFD_RELOC_386_TLS_LE_32:
297 TRACE ("BFD_RELOC_386_TLS_LE_32");
298 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
299
300 case BFD_RELOC_386_TLS_DTPMOD32:
301 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
302 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
303
304 case BFD_RELOC_386_TLS_DTPOFF32:
305 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
306 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
307
308 case BFD_RELOC_386_TLS_TPOFF32:
309 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
310 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
311
312 case BFD_RELOC_386_TLS_GOTDESC:
313 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
314 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
315
316 case BFD_RELOC_386_TLS_DESC_CALL:
317 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
318 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
319
320 case BFD_RELOC_386_TLS_DESC:
321 TRACE ("BFD_RELOC_386_TLS_DESC");
322 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
323
324 case BFD_RELOC_386_IRELATIVE:
325 TRACE ("BFD_RELOC_386_IRELATIVE");
326 return &elf_howto_table[R_386_IRELATIVE];
327
328 case BFD_RELOC_VTABLE_INHERIT:
329 TRACE ("BFD_RELOC_VTABLE_INHERIT");
330 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
331
332 case BFD_RELOC_VTABLE_ENTRY:
333 TRACE ("BFD_RELOC_VTABLE_ENTRY");
334 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
335
336 default:
337 break;
338 }
339
340 TRACE ("Unknown");
341 return 0;
342 }
343
344 static reloc_howto_type *
345 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
346 const char *r_name)
347 {
348 unsigned int i;
349
350 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
351 if (elf_howto_table[i].name != NULL
352 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
353 return &elf_howto_table[i];
354
355 return NULL;
356 }
357
358 static reloc_howto_type *
359 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
360 {
361 unsigned int indx;
362
363 if ((indx = r_type) >= R_386_standard
364 && ((indx = r_type - R_386_ext_offset) - R_386_standard
365 >= R_386_ext - R_386_standard)
366 && ((indx = r_type - R_386_tls_offset) - R_386_ext
367 >= R_386_irelative - R_386_ext)
368 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
369 >= R_386_vt - R_386_irelative))
370 {
371 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
372 abfd, (int) r_type);
373 indx = R_386_NONE;
374 }
375 BFD_ASSERT (elf_howto_table [indx].type == r_type);
376 return &elf_howto_table[indx];
377 }
378
379 static void
380 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
381 arelent *cache_ptr,
382 Elf_Internal_Rela *dst)
383 {
384 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
385 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
386 }
387
388 /* Return whether a symbol name implies a local label. The UnixWare
389 2.1 cc generates temporary symbols that start with .X, so we
390 recognize them here. FIXME: do other SVR4 compilers also use .X?.
391 If so, we should move the .X recognition into
392 _bfd_elf_is_local_label_name. */
393
394 static bfd_boolean
395 elf_i386_is_local_label_name (bfd *abfd, const char *name)
396 {
397 if (name[0] == '.' && name[1] == 'X')
398 return TRUE;
399
400 return _bfd_elf_is_local_label_name (abfd, name);
401 }
402 \f
403 /* Support for core dump NOTE sections. */
404
405 static bfd_boolean
406 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
407 {
408 int offset;
409 size_t size;
410
411 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
412 {
413 int pr_version = bfd_get_32 (abfd, note->descdata);
414
415 if (pr_version != 1)
416 return FALSE;
417
418 /* pr_cursig */
419 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
420
421 /* pr_pid */
422 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
423
424 /* pr_reg */
425 offset = 28;
426 size = bfd_get_32 (abfd, note->descdata + 8);
427 }
428 else
429 {
430 switch (note->descsz)
431 {
432 default:
433 return FALSE;
434
435 case 144: /* Linux/i386 */
436 /* pr_cursig */
437 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
438
439 /* pr_pid */
440 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
441
442 /* pr_reg */
443 offset = 72;
444 size = 68;
445
446 break;
447 }
448 }
449
450 /* Make a ".reg/999" section. */
451 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
452 size, note->descpos + offset);
453 }
454
455 static bfd_boolean
456 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
457 {
458 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
459 {
460 int pr_version = bfd_get_32 (abfd, note->descdata);
461
462 if (pr_version != 1)
463 return FALSE;
464
465 elf_tdata (abfd)->core_program
466 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
467 elf_tdata (abfd)->core_command
468 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
469 }
470 else
471 {
472 switch (note->descsz)
473 {
474 default:
475 return FALSE;
476
477 case 124: /* Linux/i386 elf_prpsinfo. */
478 elf_tdata (abfd)->core_program
479 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
480 elf_tdata (abfd)->core_command
481 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
482 }
483 }
484
485 /* Note that for some reason, a spurious space is tacked
486 onto the end of the args in some (at least one anyway)
487 implementations, so strip it off if it exists. */
488 {
489 char *command = elf_tdata (abfd)->core_command;
490 int n = strlen (command);
491
492 if (0 < n && command[n - 1] == ' ')
493 command[n - 1] = '\0';
494 }
495
496 return TRUE;
497 }
498 \f
499 /* Functions for the i386 ELF linker.
500
501 In order to gain some understanding of code in this file without
502 knowing all the intricate details of the linker, note the
503 following:
504
505 Functions named elf_i386_* are called by external routines, other
506 functions are only called locally. elf_i386_* functions appear
507 in this file more or less in the order in which they are called
508 from external routines. eg. elf_i386_check_relocs is called
509 early in the link process, elf_i386_finish_dynamic_sections is
510 one of the last functions. */
511
512
513 /* The name of the dynamic interpreter. This is put in the .interp
514 section. */
515
516 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
517
518 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
519 copying dynamic variables from a shared lib into an app's dynbss
520 section, and instead use a dynamic relocation to point into the
521 shared lib. */
522 #define ELIMINATE_COPY_RELOCS 1
523
524 /* The size in bytes of an entry in the procedure linkage table. */
525
526 #define PLT_ENTRY_SIZE 16
527
528 /* The first entry in an absolute procedure linkage table looks like
529 this. See the SVR4 ABI i386 supplement to see how this works.
530 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
531
532 static const bfd_byte elf_i386_plt0_entry[12] =
533 {
534 0xff, 0x35, /* pushl contents of address */
535 0, 0, 0, 0, /* replaced with address of .got + 4. */
536 0xff, 0x25, /* jmp indirect */
537 0, 0, 0, 0 /* replaced with address of .got + 8. */
538 };
539
540 /* Subsequent entries in an absolute procedure linkage table look like
541 this. */
542
543 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
544 {
545 0xff, 0x25, /* jmp indirect */
546 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
547 0x68, /* pushl immediate */
548 0, 0, 0, 0, /* replaced with offset into relocation table. */
549 0xe9, /* jmp relative */
550 0, 0, 0, 0 /* replaced with offset to start of .plt. */
551 };
552
553 /* The first entry in a PIC procedure linkage table look like this.
554 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
555
556 static const bfd_byte elf_i386_pic_plt0_entry[12] =
557 {
558 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
559 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
560 };
561
562 /* Subsequent entries in a PIC procedure linkage table look like this. */
563
564 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
565 {
566 0xff, 0xa3, /* jmp *offset(%ebx) */
567 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
568 0x68, /* pushl immediate */
569 0, 0, 0, 0, /* replaced with offset into relocation table. */
570 0xe9, /* jmp relative */
571 0, 0, 0, 0 /* replaced with offset to start of .plt. */
572 };
573
574 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
575 for the PLTResolve stub and then for each PLT entry. */
576 #define PLTRESOLVE_RELOCS_SHLIB 0
577 #define PLTRESOLVE_RELOCS 2
578 #define PLT_NON_JUMP_SLOT_RELOCS 2
579
580 /* i386 ELF linker hash entry. */
581
582 struct elf_i386_link_hash_entry
583 {
584 struct elf_link_hash_entry elf;
585
586 /* Track dynamic relocs copied for this symbol. */
587 struct elf_dyn_relocs *dyn_relocs;
588
589 #define GOT_UNKNOWN 0
590 #define GOT_NORMAL 1
591 #define GOT_TLS_GD 2
592 #define GOT_TLS_IE 4
593 #define GOT_TLS_IE_POS 5
594 #define GOT_TLS_IE_NEG 6
595 #define GOT_TLS_IE_BOTH 7
596 #define GOT_TLS_GDESC 8
597 #define GOT_TLS_GD_BOTH_P(type) \
598 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
599 #define GOT_TLS_GD_P(type) \
600 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
601 #define GOT_TLS_GDESC_P(type) \
602 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
603 #define GOT_TLS_GD_ANY_P(type) \
604 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
605 unsigned char tls_type;
606
607 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
608 starting at the end of the jump table. */
609 bfd_vma tlsdesc_got;
610 };
611
612 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
613
614 struct elf_i386_obj_tdata
615 {
616 struct elf_obj_tdata root;
617
618 /* tls_type for each local got entry. */
619 char *local_got_tls_type;
620
621 /* GOTPLT entries for TLS descriptors. */
622 bfd_vma *local_tlsdesc_gotent;
623 };
624
625 #define elf_i386_tdata(abfd) \
626 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
627
628 #define elf_i386_local_got_tls_type(abfd) \
629 (elf_i386_tdata (abfd)->local_got_tls_type)
630
631 #define elf_i386_local_tlsdesc_gotent(abfd) \
632 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
633
634 #define is_i386_elf(bfd) \
635 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
636 && elf_tdata (bfd) != NULL \
637 && elf_object_id (bfd) == I386_ELF_TDATA)
638
639 static bfd_boolean
640 elf_i386_mkobject (bfd *abfd)
641 {
642 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
643 I386_ELF_TDATA);
644 }
645
646 /* i386 ELF linker hash table. */
647
648 struct elf_i386_link_hash_table
649 {
650 struct elf_link_hash_table elf;
651
652 /* Short-cuts to get to dynamic linker sections. */
653 asection *sdynbss;
654 asection *srelbss;
655
656 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
657 asection *srelplt2;
658
659 /* True if the target system is VxWorks. */
660 int is_vxworks;
661
662 /* Value used to fill the last word of the first plt entry. */
663 bfd_byte plt0_pad_byte;
664
665 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
666 bfd_vma next_tls_desc_index;
667
668 union {
669 bfd_signed_vma refcount;
670 bfd_vma offset;
671 } tls_ldm_got;
672
673 /* The amount of space used by the reserved portion of the sgotplt
674 section, plus whatever space is used by the jump slots. */
675 bfd_vma sgotplt_jump_table_size;
676
677 /* Small local sym to section mapping cache. */
678 struct sym_sec_cache sym_sec;
679
680 /* _TLS_MODULE_BASE_ symbol. */
681 struct bfd_link_hash_entry *tls_module_base;
682
683 /* Used by local STT_GNU_IFUNC symbols. */
684 htab_t loc_hash_table;
685 void *loc_hash_memory;
686 };
687
688 /* Get the i386 ELF linker hash table from a link_info structure. */
689
690 #define elf_i386_hash_table(p) \
691 ((struct elf_i386_link_hash_table *) ((p)->hash))
692
693 #define elf_i386_compute_jump_table_size(htab) \
694 ((htab)->next_tls_desc_index * 4)
695
696 /* Create an entry in an i386 ELF linker hash table. */
697
698 static struct bfd_hash_entry *
699 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
700 struct bfd_hash_table *table,
701 const char *string)
702 {
703 /* Allocate the structure if it has not already been allocated by a
704 subclass. */
705 if (entry == NULL)
706 {
707 entry = bfd_hash_allocate (table,
708 sizeof (struct elf_i386_link_hash_entry));
709 if (entry == NULL)
710 return entry;
711 }
712
713 /* Call the allocation method of the superclass. */
714 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
715 if (entry != NULL)
716 {
717 struct elf_i386_link_hash_entry *eh;
718
719 eh = (struct elf_i386_link_hash_entry *) entry;
720 eh->dyn_relocs = NULL;
721 eh->tls_type = GOT_UNKNOWN;
722 eh->tlsdesc_got = (bfd_vma) -1;
723 }
724
725 return entry;
726 }
727
728 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
729 for local symbol so that we can handle local STT_GNU_IFUNC symbols
730 as global symbol. We reuse indx and dynstr_index for local symbol
731 hash since they aren't used by global symbols in this backend. */
732
733 static hashval_t
734 elf_i386_local_htab_hash (const void *ptr)
735 {
736 struct elf_link_hash_entry *h
737 = (struct elf_link_hash_entry *) ptr;
738 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
739 }
740
741 /* Compare local hash entries. */
742
743 static int
744 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
745 {
746 struct elf_link_hash_entry *h1
747 = (struct elf_link_hash_entry *) ptr1;
748 struct elf_link_hash_entry *h2
749 = (struct elf_link_hash_entry *) ptr2;
750
751 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
752 }
753
754 /* Find and/or create a hash entry for local symbol. */
755
756 static struct elf_link_hash_entry *
757 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
758 bfd *abfd, const Elf_Internal_Rela *rel,
759 bfd_boolean create)
760 {
761 struct elf_i386_link_hash_entry e, *ret;
762 asection *sec = abfd->sections;
763 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
764 ELF32_R_SYM (rel->r_info));
765 void **slot;
766
767 e.elf.indx = sec->id;
768 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
769 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
770 create ? INSERT : NO_INSERT);
771
772 if (!slot)
773 return NULL;
774
775 if (*slot)
776 {
777 ret = (struct elf_i386_link_hash_entry *) *slot;
778 return &ret->elf;
779 }
780
781 ret = (struct elf_i386_link_hash_entry *)
782 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
783 sizeof (struct elf_i386_link_hash_entry));
784 if (ret)
785 {
786 memset (ret, 0, sizeof (*ret));
787 ret->elf.indx = sec->id;
788 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
789 ret->elf.dynindx = -1;
790 ret->elf.plt.offset = (bfd_vma) -1;
791 ret->elf.got.offset = (bfd_vma) -1;
792 *slot = ret;
793 }
794 return &ret->elf;
795 }
796
797 /* Create an i386 ELF linker hash table. */
798
799 static struct bfd_link_hash_table *
800 elf_i386_link_hash_table_create (bfd *abfd)
801 {
802 struct elf_i386_link_hash_table *ret;
803 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
804
805 ret = bfd_malloc (amt);
806 if (ret == NULL)
807 return NULL;
808
809 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
810 elf_i386_link_hash_newfunc,
811 sizeof (struct elf_i386_link_hash_entry)))
812 {
813 free (ret);
814 return NULL;
815 }
816
817 ret->sdynbss = NULL;
818 ret->srelbss = NULL;
819 ret->tls_ldm_got.refcount = 0;
820 ret->next_tls_desc_index = 0;
821 ret->sgotplt_jump_table_size = 0;
822 ret->sym_sec.abfd = NULL;
823 ret->is_vxworks = 0;
824 ret->srelplt2 = NULL;
825 ret->plt0_pad_byte = 0;
826 ret->tls_module_base = NULL;
827
828 ret->loc_hash_table = htab_try_create (1024,
829 elf_i386_local_htab_hash,
830 elf_i386_local_htab_eq,
831 NULL);
832 ret->loc_hash_memory = objalloc_create ();
833 if (!ret->loc_hash_table || !ret->loc_hash_memory)
834 {
835 free (ret);
836 return NULL;
837 }
838
839 return &ret->elf.root;
840 }
841
842 /* Destroy an i386 ELF linker hash table. */
843
844 static void
845 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
846 {
847 struct elf_i386_link_hash_table *htab
848 = (struct elf_i386_link_hash_table *) hash;
849
850 if (htab->loc_hash_table)
851 htab_delete (htab->loc_hash_table);
852 if (htab->loc_hash_memory)
853 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
854 _bfd_generic_link_hash_table_free (hash);
855 }
856
857 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
858 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
859 hash table. */
860
861 static bfd_boolean
862 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
863 {
864 struct elf_i386_link_hash_table *htab;
865
866 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
867 return FALSE;
868
869 htab = elf_i386_hash_table (info);
870 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
871 if (!info->shared)
872 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
873
874 if (!htab->sdynbss
875 || (!info->shared && !htab->srelbss))
876 abort ();
877
878 if (htab->is_vxworks
879 && !elf_vxworks_create_dynamic_sections (dynobj, info,
880 &htab->srelplt2))
881 return FALSE;
882
883 return TRUE;
884 }
885
886 /* Copy the extra info we tack onto an elf_link_hash_entry. */
887
888 static void
889 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
890 struct elf_link_hash_entry *dir,
891 struct elf_link_hash_entry *ind)
892 {
893 struct elf_i386_link_hash_entry *edir, *eind;
894
895 edir = (struct elf_i386_link_hash_entry *) dir;
896 eind = (struct elf_i386_link_hash_entry *) ind;
897
898 if (eind->dyn_relocs != NULL)
899 {
900 if (edir->dyn_relocs != NULL)
901 {
902 struct elf_dyn_relocs **pp;
903 struct elf_dyn_relocs *p;
904
905 /* Add reloc counts against the indirect sym to the direct sym
906 list. Merge any entries against the same section. */
907 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
908 {
909 struct elf_dyn_relocs *q;
910
911 for (q = edir->dyn_relocs; q != NULL; q = q->next)
912 if (q->sec == p->sec)
913 {
914 q->pc_count += p->pc_count;
915 q->count += p->count;
916 *pp = p->next;
917 break;
918 }
919 if (q == NULL)
920 pp = &p->next;
921 }
922 *pp = edir->dyn_relocs;
923 }
924
925 edir->dyn_relocs = eind->dyn_relocs;
926 eind->dyn_relocs = NULL;
927 }
928
929 if (ind->root.type == bfd_link_hash_indirect
930 && dir->got.refcount <= 0)
931 {
932 edir->tls_type = eind->tls_type;
933 eind->tls_type = GOT_UNKNOWN;
934 }
935
936 if (ELIMINATE_COPY_RELOCS
937 && ind->root.type != bfd_link_hash_indirect
938 && dir->dynamic_adjusted)
939 {
940 /* If called to transfer flags for a weakdef during processing
941 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
942 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
943 dir->ref_dynamic |= ind->ref_dynamic;
944 dir->ref_regular |= ind->ref_regular;
945 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
946 dir->needs_plt |= ind->needs_plt;
947 dir->pointer_equality_needed |= ind->pointer_equality_needed;
948 }
949 else
950 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
951 }
952
953 typedef union
954 {
955 unsigned char c[2];
956 uint16_t i;
957 }
958 i386_opcode16;
959
960 /* Return TRUE if the TLS access code sequence support transition
961 from R_TYPE. */
962
963 static bfd_boolean
964 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
965 bfd_byte *contents,
966 Elf_Internal_Shdr *symtab_hdr,
967 struct elf_link_hash_entry **sym_hashes,
968 unsigned int r_type,
969 const Elf_Internal_Rela *rel,
970 const Elf_Internal_Rela *relend)
971 {
972 unsigned int val, type;
973 unsigned long r_symndx;
974 struct elf_link_hash_entry *h;
975 bfd_vma offset;
976
977 /* Get the section contents. */
978 if (contents == NULL)
979 {
980 if (elf_section_data (sec)->this_hdr.contents != NULL)
981 contents = elf_section_data (sec)->this_hdr.contents;
982 else
983 {
984 /* FIXME: How to better handle error condition? */
985 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
986 return FALSE;
987
988 /* Cache the section contents for elf_link_input_bfd. */
989 elf_section_data (sec)->this_hdr.contents = contents;
990 }
991 }
992
993 offset = rel->r_offset;
994 switch (r_type)
995 {
996 case R_386_TLS_GD:
997 case R_386_TLS_LDM:
998 if (offset < 2 || (rel + 1) >= relend)
999 return FALSE;
1000
1001 type = bfd_get_8 (abfd, contents + offset - 2);
1002 if (r_type == R_386_TLS_GD)
1003 {
1004 /* Check transition from GD access model. Only
1005 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1006 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1007 can transit to different access model. */
1008 if ((offset + 10) > sec->size ||
1009 (type != 0x8d && type != 0x04))
1010 return FALSE;
1011
1012 val = bfd_get_8 (abfd, contents + offset - 1);
1013 if (type == 0x04)
1014 {
1015 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1016 if (offset < 3)
1017 return FALSE;
1018
1019 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1020 return FALSE;
1021
1022 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1023 return FALSE;
1024 }
1025 else
1026 {
1027 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1028 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1029 return FALSE;
1030
1031 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1032 return FALSE;
1033 }
1034 }
1035 else
1036 {
1037 /* Check transition from LD access model. Only
1038 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1039 can transit to different access model. */
1040 if (type != 0x8d || (offset + 9) > sec->size)
1041 return FALSE;
1042
1043 val = bfd_get_8 (abfd, contents + offset - 1);
1044 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1045 return FALSE;
1046 }
1047
1048 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1049 return FALSE;
1050
1051 r_symndx = ELF32_R_SYM (rel[1].r_info);
1052 if (r_symndx < symtab_hdr->sh_info)
1053 return FALSE;
1054
1055 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1056 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1057 may be versioned. */
1058 return (h != NULL
1059 && h->root.root.string != NULL
1060 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1061 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1062 && (strncmp (h->root.root.string, "___tls_get_addr",
1063 15) == 0));
1064
1065 case R_386_TLS_IE:
1066 /* Check transition from IE access model:
1067 movl foo@indntpoff(%rip), %eax
1068 movl foo@indntpoff(%rip), %reg
1069 addl foo@indntpoff(%rip), %reg
1070 */
1071
1072 if (offset < 1 || (offset + 4) > sec->size)
1073 return FALSE;
1074
1075 /* Check "movl foo@tpoff(%rip), %eax" first. */
1076 val = bfd_get_8 (abfd, contents + offset - 1);
1077 if (val == 0xa1)
1078 return TRUE;
1079
1080 if (offset < 2)
1081 return FALSE;
1082
1083 /* Check movl|addl foo@tpoff(%rip), %reg. */
1084 type = bfd_get_8 (abfd, contents + offset - 2);
1085 return ((type == 0x8b || type == 0x03)
1086 && (val & 0xc7) == 0x05);
1087
1088 case R_386_TLS_GOTIE:
1089 case R_386_TLS_IE_32:
1090 /* Check transition from {IE_32,GOTIE} access model:
1091 subl foo@{tpoff,gontoff}(%reg1), %reg2
1092 movl foo@{tpoff,gontoff}(%reg1), %reg2
1093 addl foo@{tpoff,gontoff}(%reg1), %reg2
1094 */
1095
1096 if (offset < 2 || (offset + 4) > sec->size)
1097 return FALSE;
1098
1099 val = bfd_get_8 (abfd, contents + offset - 1);
1100 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1101 return FALSE;
1102
1103 type = bfd_get_8 (abfd, contents + offset - 2);
1104 return type == 0x8b || type == 0x2b || type == 0x03;
1105
1106 case R_386_TLS_GOTDESC:
1107 /* Check transition from GDesc access model:
1108 leal x@tlsdesc(%ebx), %eax
1109
1110 Make sure it's a leal adding ebx to a 32-bit offset
1111 into any register, although it's probably almost always
1112 going to be eax. */
1113
1114 if (offset < 2 || (offset + 4) > sec->size)
1115 return FALSE;
1116
1117 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1118 return FALSE;
1119
1120 val = bfd_get_8 (abfd, contents + offset - 1);
1121 return (val & 0xc7) == 0x83;
1122
1123 case R_386_TLS_DESC_CALL:
1124 /* Check transition from GDesc access model:
1125 call *x@tlsdesc(%rax)
1126 */
1127 if (offset + 2 <= sec->size)
1128 {
1129 /* Make sure that it's a call *x@tlsdesc(%rax). */
1130 static i386_opcode16 call = { { 0xff, 0x10 } };
1131 return bfd_get_16 (abfd, contents + offset) == call.i;
1132 }
1133
1134 return FALSE;
1135
1136 default:
1137 abort ();
1138 }
1139 }
1140
1141 /* Return TRUE if the TLS access transition is OK or no transition
1142 will be performed. Update R_TYPE if there is a transition. */
1143
1144 static bfd_boolean
1145 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1146 asection *sec, bfd_byte *contents,
1147 Elf_Internal_Shdr *symtab_hdr,
1148 struct elf_link_hash_entry **sym_hashes,
1149 unsigned int *r_type, int tls_type,
1150 const Elf_Internal_Rela *rel,
1151 const Elf_Internal_Rela *relend,
1152 struct elf_link_hash_entry *h)
1153 {
1154 unsigned int from_type = *r_type;
1155 unsigned int to_type = from_type;
1156 bfd_boolean check = TRUE;
1157
1158 switch (from_type)
1159 {
1160 case R_386_TLS_GD:
1161 case R_386_TLS_GOTDESC:
1162 case R_386_TLS_DESC_CALL:
1163 case R_386_TLS_IE_32:
1164 case R_386_TLS_IE:
1165 case R_386_TLS_GOTIE:
1166 if (!info->shared)
1167 {
1168 if (h == NULL)
1169 to_type = R_386_TLS_LE_32;
1170 else if (from_type != R_386_TLS_IE
1171 && from_type != R_386_TLS_GOTIE)
1172 to_type = R_386_TLS_IE_32;
1173 }
1174
1175 /* When we are called from elf_i386_relocate_section, CONTENTS
1176 isn't NULL and there may be additional transitions based on
1177 TLS_TYPE. */
1178 if (contents != NULL)
1179 {
1180 unsigned int new_to_type = to_type;
1181
1182 if (!info->shared
1183 && h != NULL
1184 && h->dynindx == -1
1185 && (tls_type & GOT_TLS_IE))
1186 new_to_type = R_386_TLS_LE_32;
1187
1188 if (to_type == R_386_TLS_GD
1189 || to_type == R_386_TLS_GOTDESC
1190 || to_type == R_386_TLS_DESC_CALL)
1191 {
1192 if (tls_type == GOT_TLS_IE_POS)
1193 new_to_type = R_386_TLS_GOTIE;
1194 else if (tls_type & GOT_TLS_IE)
1195 new_to_type = R_386_TLS_IE_32;
1196 }
1197
1198 /* We checked the transition before when we were called from
1199 elf_i386_check_relocs. We only want to check the new
1200 transition which hasn't been checked before. */
1201 check = new_to_type != to_type && from_type == to_type;
1202 to_type = new_to_type;
1203 }
1204
1205 break;
1206
1207 case R_386_TLS_LDM:
1208 if (!info->shared)
1209 to_type = R_386_TLS_LE_32;
1210 break;
1211
1212 default:
1213 return TRUE;
1214 }
1215
1216 /* Return TRUE if there is no transition. */
1217 if (from_type == to_type)
1218 return TRUE;
1219
1220 /* Check if the transition can be performed. */
1221 if (check
1222 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1223 symtab_hdr, sym_hashes,
1224 from_type, rel, relend))
1225 {
1226 reloc_howto_type *from, *to;
1227
1228 from = elf_i386_rtype_to_howto (abfd, from_type);
1229 to = elf_i386_rtype_to_howto (abfd, to_type);
1230
1231 (*_bfd_error_handler)
1232 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1233 "in section `%A' failed"),
1234 abfd, sec, from->name, to->name,
1235 h ? h->root.root.string : "a local symbol",
1236 (unsigned long) rel->r_offset);
1237 bfd_set_error (bfd_error_bad_value);
1238 return FALSE;
1239 }
1240
1241 *r_type = to_type;
1242 return TRUE;
1243 }
1244
1245 /* Look through the relocs for a section during the first phase, and
1246 calculate needed space in the global offset table, procedure linkage
1247 table, and dynamic reloc sections. */
1248
1249 static bfd_boolean
1250 elf_i386_check_relocs (bfd *abfd,
1251 struct bfd_link_info *info,
1252 asection *sec,
1253 const Elf_Internal_Rela *relocs)
1254 {
1255 struct elf_i386_link_hash_table *htab;
1256 Elf_Internal_Shdr *symtab_hdr;
1257 struct elf_link_hash_entry **sym_hashes;
1258 const Elf_Internal_Rela *rel;
1259 const Elf_Internal_Rela *rel_end;
1260 asection *sreloc;
1261 Elf_Internal_Sym *isymbuf;
1262
1263 if (info->relocatable)
1264 return TRUE;
1265
1266 BFD_ASSERT (is_i386_elf (abfd));
1267
1268 htab = elf_i386_hash_table (info);
1269 symtab_hdr = &elf_symtab_hdr (abfd);
1270 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1271 sym_hashes = elf_sym_hashes (abfd);
1272
1273 sreloc = NULL;
1274
1275 rel_end = relocs + sec->reloc_count;
1276 for (rel = relocs; rel < rel_end; rel++)
1277 {
1278 unsigned int r_type;
1279 unsigned long r_symndx;
1280 struct elf_link_hash_entry *h;
1281
1282 r_symndx = ELF32_R_SYM (rel->r_info);
1283 r_type = ELF32_R_TYPE (rel->r_info);
1284
1285 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1286 {
1287 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1288 abfd,
1289 r_symndx);
1290 return FALSE;
1291 }
1292
1293 if (r_symndx < symtab_hdr->sh_info)
1294 {
1295 /* A local symbol. */
1296 Elf_Internal_Sym *isym;
1297
1298 /* Read this BFD's local symbols. */
1299 if (isymbuf == NULL)
1300 {
1301 if (isymbuf == NULL)
1302 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
1303 symtab_hdr->sh_info, 0,
1304 NULL, NULL, NULL);
1305 if (isymbuf == NULL)
1306 return FALSE;
1307 }
1308
1309 /* Check relocation against local STT_GNU_IFUNC symbol. */
1310 isym = isymbuf + r_symndx;
1311 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1312 {
1313 h = elf_i386_get_local_sym_hash (htab, abfd, rel,
1314 TRUE);
1315 if (h == NULL)
1316 return FALSE;
1317
1318 /* Fake a STT_GNU_IFUNC symbol. */
1319 h->type = STT_GNU_IFUNC;
1320 h->def_regular = 1;
1321 h->ref_regular = 1;
1322 h->forced_local = 1;
1323 h->root.type = bfd_link_hash_defined;
1324 }
1325 else
1326 h = NULL;
1327 }
1328 else
1329 {
1330 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1331 while (h->root.type == bfd_link_hash_indirect
1332 || h->root.type == bfd_link_hash_warning)
1333 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1334 }
1335
1336 if (h != NULL)
1337 {
1338 /* Create the ifunc sections for static executables. If we
1339 never see an indirect function symbol nor we are building
1340 a static executable, those sections will be empty and
1341 won't appear in output. */
1342 switch (r_type)
1343 {
1344 default:
1345 break;
1346
1347 case R_386_32:
1348 case R_386_PC32:
1349 case R_386_PLT32:
1350 case R_386_GOT32:
1351 case R_386_GOTOFF:
1352 if (!_bfd_elf_create_ifunc_sections (abfd, info))
1353 return FALSE;
1354 break;
1355 }
1356
1357 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1358 it here if it is defined in a non-shared object. */
1359 if (h->type == STT_GNU_IFUNC
1360 && h->def_regular)
1361 {
1362 /* It is referenced by a non-shared object. */
1363 h->ref_regular = 1;
1364
1365 /* STT_GNU_IFUNC symbol must go through PLT. */
1366 h->plt.refcount += 1;
1367
1368 /* STT_GNU_IFUNC needs dynamic sections. */
1369 if (htab->elf.dynobj == NULL)
1370 htab->elf.dynobj = abfd;
1371
1372 switch (r_type)
1373 {
1374 default:
1375 (*_bfd_error_handler)
1376 (_("%B: relocation %s against STT_GNU_IFUNC "
1377 "symbol `%s' isn't handled by %s"), abfd,
1378 elf_howto_table[r_type].name,
1379 (h->root.root.string
1380 ? h->root.root.string : "a local symbol"),
1381 __FUNCTION__);
1382 bfd_set_error (bfd_error_bad_value);
1383 return FALSE;
1384
1385 case R_386_32:
1386 h->non_got_ref = 1;
1387 h->pointer_equality_needed = 1;
1388 if (info->shared)
1389 {
1390 /* We must copy these reloc types into the
1391 output file. Create a reloc section in
1392 dynobj and make room for this reloc. */
1393 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1394 (abfd, info, sec, sreloc,
1395 &((struct elf_i386_link_hash_entry *) h)->dyn_relocs);
1396 if (sreloc == NULL)
1397 return FALSE;
1398 }
1399 break;
1400
1401 case R_386_PC32:
1402 h->non_got_ref = 1;
1403 break;
1404
1405 case R_386_PLT32:
1406 break;
1407
1408 case R_386_GOT32:
1409 case R_386_GOTOFF:
1410 h->got.refcount += 1;
1411 if (htab->elf.sgot == NULL
1412 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1413 info))
1414 return FALSE;
1415 break;
1416 }
1417
1418 continue;
1419 }
1420 }
1421
1422 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1423 symtab_hdr, sym_hashes,
1424 &r_type, GOT_UNKNOWN,
1425 rel, rel_end, h))
1426 return FALSE;
1427
1428 switch (r_type)
1429 {
1430 case R_386_TLS_LDM:
1431 htab->tls_ldm_got.refcount += 1;
1432 goto create_got;
1433
1434 case R_386_PLT32:
1435 /* This symbol requires a procedure linkage table entry. We
1436 actually build the entry in adjust_dynamic_symbol,
1437 because this might be a case of linking PIC code which is
1438 never referenced by a dynamic object, in which case we
1439 don't need to generate a procedure linkage table entry
1440 after all. */
1441
1442 /* If this is a local symbol, we resolve it directly without
1443 creating a procedure linkage table entry. */
1444 if (h == NULL)
1445 continue;
1446
1447 h->needs_plt = 1;
1448 h->plt.refcount += 1;
1449 break;
1450
1451 case R_386_TLS_IE_32:
1452 case R_386_TLS_IE:
1453 case R_386_TLS_GOTIE:
1454 if (info->shared)
1455 info->flags |= DF_STATIC_TLS;
1456 /* Fall through */
1457
1458 case R_386_GOT32:
1459 case R_386_TLS_GD:
1460 case R_386_TLS_GOTDESC:
1461 case R_386_TLS_DESC_CALL:
1462 /* This symbol requires a global offset table entry. */
1463 {
1464 int tls_type, old_tls_type;
1465
1466 switch (r_type)
1467 {
1468 default:
1469 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1470 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1471 case R_386_TLS_GOTDESC:
1472 case R_386_TLS_DESC_CALL:
1473 tls_type = GOT_TLS_GDESC; break;
1474 case R_386_TLS_IE_32:
1475 if (ELF32_R_TYPE (rel->r_info) == r_type)
1476 tls_type = GOT_TLS_IE_NEG;
1477 else
1478 /* If this is a GD->IE transition, we may use either of
1479 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1480 tls_type = GOT_TLS_IE;
1481 break;
1482 case R_386_TLS_IE:
1483 case R_386_TLS_GOTIE:
1484 tls_type = GOT_TLS_IE_POS; break;
1485 }
1486
1487 if (h != NULL)
1488 {
1489 h->got.refcount += 1;
1490 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1491 }
1492 else
1493 {
1494 bfd_signed_vma *local_got_refcounts;
1495
1496 /* This is a global offset table entry for a local symbol. */
1497 local_got_refcounts = elf_local_got_refcounts (abfd);
1498 if (local_got_refcounts == NULL)
1499 {
1500 bfd_size_type size;
1501
1502 size = symtab_hdr->sh_info;
1503 size *= (sizeof (bfd_signed_vma)
1504 + sizeof (bfd_vma) + sizeof(char));
1505 local_got_refcounts = bfd_zalloc (abfd, size);
1506 if (local_got_refcounts == NULL)
1507 return FALSE;
1508 elf_local_got_refcounts (abfd) = local_got_refcounts;
1509 elf_i386_local_tlsdesc_gotent (abfd)
1510 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1511 elf_i386_local_got_tls_type (abfd)
1512 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1513 }
1514 local_got_refcounts[r_symndx] += 1;
1515 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1516 }
1517
1518 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1519 tls_type |= old_tls_type;
1520 /* If a TLS symbol is accessed using IE at least once,
1521 there is no point to use dynamic model for it. */
1522 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1523 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1524 || (tls_type & GOT_TLS_IE) == 0))
1525 {
1526 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1527 tls_type = old_tls_type;
1528 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1529 && GOT_TLS_GD_ANY_P (tls_type))
1530 tls_type |= old_tls_type;
1531 else
1532 {
1533 (*_bfd_error_handler)
1534 (_("%B: `%s' accessed both as normal and "
1535 "thread local symbol"),
1536 abfd,
1537 h ? h->root.root.string : "<local>");
1538 return FALSE;
1539 }
1540 }
1541
1542 if (old_tls_type != tls_type)
1543 {
1544 if (h != NULL)
1545 elf_i386_hash_entry (h)->tls_type = tls_type;
1546 else
1547 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1548 }
1549 }
1550 /* Fall through */
1551
1552 case R_386_GOTOFF:
1553 case R_386_GOTPC:
1554 create_got:
1555 if (htab->elf.sgot == NULL)
1556 {
1557 if (htab->elf.dynobj == NULL)
1558 htab->elf.dynobj = abfd;
1559 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1560 return FALSE;
1561 }
1562 if (r_type != R_386_TLS_IE)
1563 break;
1564 /* Fall through */
1565
1566 case R_386_TLS_LE_32:
1567 case R_386_TLS_LE:
1568 if (!info->shared)
1569 break;
1570 info->flags |= DF_STATIC_TLS;
1571 /* Fall through */
1572
1573 case R_386_32:
1574 case R_386_PC32:
1575 if (h != NULL && info->executable)
1576 {
1577 /* If this reloc is in a read-only section, we might
1578 need a copy reloc. We can't check reliably at this
1579 stage whether the section is read-only, as input
1580 sections have not yet been mapped to output sections.
1581 Tentatively set the flag for now, and correct in
1582 adjust_dynamic_symbol. */
1583 h->non_got_ref = 1;
1584
1585 /* We may need a .plt entry if the function this reloc
1586 refers to is in a shared lib. */
1587 h->plt.refcount += 1;
1588 if (r_type != R_386_PC32)
1589 h->pointer_equality_needed = 1;
1590 }
1591
1592 /* If we are creating a shared library, and this is a reloc
1593 against a global symbol, or a non PC relative reloc
1594 against a local symbol, then we need to copy the reloc
1595 into the shared library. However, if we are linking with
1596 -Bsymbolic, we do not need to copy a reloc against a
1597 global symbol which is defined in an object we are
1598 including in the link (i.e., DEF_REGULAR is set). At
1599 this point we have not seen all the input files, so it is
1600 possible that DEF_REGULAR is not set now but will be set
1601 later (it is never cleared). In case of a weak definition,
1602 DEF_REGULAR may be cleared later by a strong definition in
1603 a shared library. We account for that possibility below by
1604 storing information in the relocs_copied field of the hash
1605 table entry. A similar situation occurs when creating
1606 shared libraries and symbol visibility changes render the
1607 symbol local.
1608
1609 If on the other hand, we are creating an executable, we
1610 may need to keep relocations for symbols satisfied by a
1611 dynamic library if we manage to avoid copy relocs for the
1612 symbol. */
1613 if ((info->shared
1614 && (sec->flags & SEC_ALLOC) != 0
1615 && (r_type != R_386_PC32
1616 || (h != NULL
1617 && (! SYMBOLIC_BIND (info, h)
1618 || h->root.type == bfd_link_hash_defweak
1619 || !h->def_regular))))
1620 || (ELIMINATE_COPY_RELOCS
1621 && !info->shared
1622 && (sec->flags & SEC_ALLOC) != 0
1623 && h != NULL
1624 && (h->root.type == bfd_link_hash_defweak
1625 || !h->def_regular)))
1626 {
1627 struct elf_dyn_relocs *p;
1628 struct elf_dyn_relocs **head;
1629
1630 /* We must copy these reloc types into the output file.
1631 Create a reloc section in dynobj and make room for
1632 this reloc. */
1633 if (sreloc == NULL)
1634 {
1635 if (htab->elf.dynobj == NULL)
1636 htab->elf.dynobj = abfd;
1637
1638 sreloc = _bfd_elf_make_dynamic_reloc_section
1639 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1640
1641 if (sreloc == NULL)
1642 return FALSE;
1643 }
1644
1645 /* If this is a global symbol, we count the number of
1646 relocations we need for this symbol. */
1647 if (h != NULL)
1648 {
1649 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1650 }
1651 else
1652 {
1653 void **vpp;
1654 /* Track dynamic relocs needed for local syms too.
1655 We really need local syms available to do this
1656 easily. Oh well. */
1657
1658 asection *s;
1659 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1660 sec, r_symndx);
1661 if (s == NULL)
1662 return FALSE;
1663
1664 vpp = &elf_section_data (s)->local_dynrel;
1665 head = (struct elf_dyn_relocs **)vpp;
1666 }
1667
1668 p = *head;
1669 if (p == NULL || p->sec != sec)
1670 {
1671 bfd_size_type amt = sizeof *p;
1672 p = bfd_alloc (htab->elf.dynobj, amt);
1673 if (p == NULL)
1674 return FALSE;
1675 p->next = *head;
1676 *head = p;
1677 p->sec = sec;
1678 p->count = 0;
1679 p->pc_count = 0;
1680 }
1681
1682 p->count += 1;
1683 if (r_type == R_386_PC32)
1684 p->pc_count += 1;
1685 }
1686 break;
1687
1688 /* This relocation describes the C++ object vtable hierarchy.
1689 Reconstruct it for later use during GC. */
1690 case R_386_GNU_VTINHERIT:
1691 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1692 return FALSE;
1693 break;
1694
1695 /* This relocation describes which C++ vtable entries are actually
1696 used. Record for later use during GC. */
1697 case R_386_GNU_VTENTRY:
1698 BFD_ASSERT (h != NULL);
1699 if (h != NULL
1700 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1701 return FALSE;
1702 break;
1703
1704 default:
1705 break;
1706 }
1707 }
1708
1709 return TRUE;
1710 }
1711
1712 /* Return the section that should be marked against GC for a given
1713 relocation. */
1714
1715 static asection *
1716 elf_i386_gc_mark_hook (asection *sec,
1717 struct bfd_link_info *info,
1718 Elf_Internal_Rela *rel,
1719 struct elf_link_hash_entry *h,
1720 Elf_Internal_Sym *sym)
1721 {
1722 if (h != NULL)
1723 switch (ELF32_R_TYPE (rel->r_info))
1724 {
1725 case R_386_GNU_VTINHERIT:
1726 case R_386_GNU_VTENTRY:
1727 return NULL;
1728 }
1729
1730 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1731 }
1732
1733 /* Update the got entry reference counts for the section being removed. */
1734
1735 static bfd_boolean
1736 elf_i386_gc_sweep_hook (bfd *abfd,
1737 struct bfd_link_info *info,
1738 asection *sec,
1739 const Elf_Internal_Rela *relocs)
1740 {
1741 Elf_Internal_Shdr *symtab_hdr;
1742 struct elf_link_hash_entry **sym_hashes;
1743 bfd_signed_vma *local_got_refcounts;
1744 const Elf_Internal_Rela *rel, *relend;
1745
1746 if (info->relocatable)
1747 return TRUE;
1748
1749 elf_section_data (sec)->local_dynrel = NULL;
1750
1751 symtab_hdr = &elf_symtab_hdr (abfd);
1752 sym_hashes = elf_sym_hashes (abfd);
1753 local_got_refcounts = elf_local_got_refcounts (abfd);
1754
1755 relend = relocs + sec->reloc_count;
1756 for (rel = relocs; rel < relend; rel++)
1757 {
1758 unsigned long r_symndx;
1759 unsigned int r_type;
1760 struct elf_link_hash_entry *h = NULL;
1761
1762 r_symndx = ELF32_R_SYM (rel->r_info);
1763 if (r_symndx >= symtab_hdr->sh_info)
1764 {
1765 struct elf_i386_link_hash_entry *eh;
1766 struct elf_dyn_relocs **pp;
1767 struct elf_dyn_relocs *p;
1768
1769 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1770 while (h->root.type == bfd_link_hash_indirect
1771 || h->root.type == bfd_link_hash_warning)
1772 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1773 eh = (struct elf_i386_link_hash_entry *) h;
1774
1775 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1776 if (p->sec == sec)
1777 {
1778 /* Everything must go for SEC. */
1779 *pp = p->next;
1780 break;
1781 }
1782 }
1783
1784 r_type = ELF32_R_TYPE (rel->r_info);
1785 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1786 symtab_hdr, sym_hashes,
1787 &r_type, GOT_UNKNOWN,
1788 rel, relend, h))
1789 return FALSE;
1790
1791 switch (r_type)
1792 {
1793 case R_386_TLS_LDM:
1794 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1795 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1796 break;
1797
1798 case R_386_TLS_GD:
1799 case R_386_TLS_GOTDESC:
1800 case R_386_TLS_DESC_CALL:
1801 case R_386_TLS_IE_32:
1802 case R_386_TLS_IE:
1803 case R_386_TLS_GOTIE:
1804 case R_386_GOT32:
1805 if (h != NULL)
1806 {
1807 if (h->got.refcount > 0)
1808 h->got.refcount -= 1;
1809 }
1810 else if (local_got_refcounts != NULL)
1811 {
1812 if (local_got_refcounts[r_symndx] > 0)
1813 local_got_refcounts[r_symndx] -= 1;
1814 }
1815 break;
1816
1817 case R_386_32:
1818 case R_386_PC32:
1819 if (info->shared)
1820 break;
1821 /* Fall through */
1822
1823 case R_386_PLT32:
1824 if (h != NULL)
1825 {
1826 if (h->plt.refcount > 0)
1827 h->plt.refcount -= 1;
1828 }
1829 break;
1830
1831 default:
1832 break;
1833 }
1834 }
1835
1836 return TRUE;
1837 }
1838
1839 /* Adjust a symbol defined by a dynamic object and referenced by a
1840 regular object. The current definition is in some section of the
1841 dynamic object, but we're not including those sections. We have to
1842 change the definition to something the rest of the link can
1843 understand. */
1844
1845 static bfd_boolean
1846 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1847 struct elf_link_hash_entry *h)
1848 {
1849 struct elf_i386_link_hash_table *htab;
1850 asection *s;
1851
1852 /* STT_GNU_IFUNC symbol must go through PLT. */
1853 if (h->type == STT_GNU_IFUNC)
1854 {
1855 if (h->plt.refcount <= 0)
1856 {
1857 h->plt.offset = (bfd_vma) -1;
1858 h->needs_plt = 0;
1859 }
1860 return TRUE;
1861 }
1862
1863 /* If this is a function, put it in the procedure linkage table. We
1864 will fill in the contents of the procedure linkage table later,
1865 when we know the address of the .got section. */
1866 if (h->type == STT_FUNC
1867 || h->needs_plt)
1868 {
1869 if (h->plt.refcount <= 0
1870 || SYMBOL_CALLS_LOCAL (info, h)
1871 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1872 && h->root.type == bfd_link_hash_undefweak))
1873 {
1874 /* This case can occur if we saw a PLT32 reloc in an input
1875 file, but the symbol was never referred to by a dynamic
1876 object, or if all references were garbage collected. In
1877 such a case, we don't actually need to build a procedure
1878 linkage table, and we can just do a PC32 reloc instead. */
1879 h->plt.offset = (bfd_vma) -1;
1880 h->needs_plt = 0;
1881 }
1882
1883 return TRUE;
1884 }
1885 else
1886 /* It's possible that we incorrectly decided a .plt reloc was
1887 needed for an R_386_PC32 reloc to a non-function sym in
1888 check_relocs. We can't decide accurately between function and
1889 non-function syms in check-relocs; Objects loaded later in
1890 the link may change h->type. So fix it now. */
1891 h->plt.offset = (bfd_vma) -1;
1892
1893 /* If this is a weak symbol, and there is a real definition, the
1894 processor independent code will have arranged for us to see the
1895 real definition first, and we can just use the same value. */
1896 if (h->u.weakdef != NULL)
1897 {
1898 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1899 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1900 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1901 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1902 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1903 h->non_got_ref = h->u.weakdef->non_got_ref;
1904 return TRUE;
1905 }
1906
1907 /* This is a reference to a symbol defined by a dynamic object which
1908 is not a function. */
1909
1910 /* If we are creating a shared library, we must presume that the
1911 only references to the symbol are via the global offset table.
1912 For such cases we need not do anything here; the relocations will
1913 be handled correctly by relocate_section. */
1914 if (info->shared)
1915 return TRUE;
1916
1917 /* If there are no references to this symbol that do not use the
1918 GOT, we don't need to generate a copy reloc. */
1919 if (!h->non_got_ref)
1920 return TRUE;
1921
1922 /* If -z nocopyreloc was given, we won't generate them either. */
1923 if (info->nocopyreloc)
1924 {
1925 h->non_got_ref = 0;
1926 return TRUE;
1927 }
1928
1929 htab = elf_i386_hash_table (info);
1930
1931 /* If there aren't any dynamic relocs in read-only sections, then
1932 we can keep the dynamic relocs and avoid the copy reloc. This
1933 doesn't work on VxWorks, where we can not have dynamic relocations
1934 (other than copy and jump slot relocations) in an executable. */
1935 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1936 {
1937 struct elf_i386_link_hash_entry * eh;
1938 struct elf_dyn_relocs *p;
1939
1940 eh = (struct elf_i386_link_hash_entry *) h;
1941 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1942 {
1943 s = p->sec->output_section;
1944 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1945 break;
1946 }
1947
1948 if (p == NULL)
1949 {
1950 h->non_got_ref = 0;
1951 return TRUE;
1952 }
1953 }
1954
1955 if (h->size == 0)
1956 {
1957 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1958 h->root.root.string);
1959 return TRUE;
1960 }
1961
1962 /* We must allocate the symbol in our .dynbss section, which will
1963 become part of the .bss section of the executable. There will be
1964 an entry for this symbol in the .dynsym section. The dynamic
1965 object will contain position independent code, so all references
1966 from the dynamic object to this symbol will go through the global
1967 offset table. The dynamic linker will use the .dynsym entry to
1968 determine the address it must put in the global offset table, so
1969 both the dynamic object and the regular object will refer to the
1970 same memory location for the variable. */
1971
1972 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1973 copy the initial value out of the dynamic object and into the
1974 runtime process image. */
1975 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1976 {
1977 htab->srelbss->size += sizeof (Elf32_External_Rel);
1978 h->needs_copy = 1;
1979 }
1980
1981 s = htab->sdynbss;
1982
1983 return _bfd_elf_adjust_dynamic_copy (h, s);
1984 }
1985
1986 /* Allocate space in .plt, .got and associated reloc sections for
1987 dynamic relocs. */
1988
1989 static bfd_boolean
1990 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1991 {
1992 struct bfd_link_info *info;
1993 struct elf_i386_link_hash_table *htab;
1994 struct elf_i386_link_hash_entry *eh;
1995 struct elf_dyn_relocs *p;
1996
1997 if (h->root.type == bfd_link_hash_indirect)
1998 return TRUE;
1999
2000 if (h->root.type == bfd_link_hash_warning)
2001 /* When warning symbols are created, they **replace** the "real"
2002 entry in the hash table, thus we never get to see the real
2003 symbol in a hash traversal. So look at it now. */
2004 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2005 eh = (struct elf_i386_link_hash_entry *) h;
2006
2007 info = (struct bfd_link_info *) inf;
2008 htab = elf_i386_hash_table (info);
2009
2010 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2011 here if it is defined and referenced in a non-shared object. */
2012 if (h->type == STT_GNU_IFUNC
2013 && h->def_regular)
2014 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2015 &eh->dyn_relocs,
2016 PLT_ENTRY_SIZE, 4);
2017 else if (htab->elf.dynamic_sections_created
2018 && h->plt.refcount > 0)
2019 {
2020 /* Make sure this symbol is output as a dynamic symbol.
2021 Undefined weak syms won't yet be marked as dynamic. */
2022 if (h->dynindx == -1
2023 && !h->forced_local)
2024 {
2025 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2026 return FALSE;
2027 }
2028
2029 if (info->shared
2030 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2031 {
2032 asection *s = htab->elf.splt;
2033
2034 /* If this is the first .plt entry, make room for the special
2035 first entry. */
2036 if (s->size == 0)
2037 s->size += PLT_ENTRY_SIZE;
2038
2039 h->plt.offset = s->size;
2040
2041 /* If this symbol is not defined in a regular file, and we are
2042 not generating a shared library, then set the symbol to this
2043 location in the .plt. This is required to make function
2044 pointers compare as equal between the normal executable and
2045 the shared library. */
2046 if (! info->shared
2047 && !h->def_regular)
2048 {
2049 h->root.u.def.section = s;
2050 h->root.u.def.value = h->plt.offset;
2051 }
2052
2053 /* Make room for this entry. */
2054 s->size += PLT_ENTRY_SIZE;
2055
2056 /* We also need to make an entry in the .got.plt section, which
2057 will be placed in the .got section by the linker script. */
2058 htab->elf.sgotplt->size += 4;
2059
2060 /* We also need to make an entry in the .rel.plt section. */
2061 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2062 htab->next_tls_desc_index++;
2063
2064 if (htab->is_vxworks && !info->shared)
2065 {
2066 /* VxWorks has a second set of relocations for each PLT entry
2067 in executables. They go in a separate relocation section,
2068 which is processed by the kernel loader. */
2069
2070 /* There are two relocations for the initial PLT entry: an
2071 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2072 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2073
2074 if (h->plt.offset == PLT_ENTRY_SIZE)
2075 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2076
2077 /* There are two extra relocations for each subsequent PLT entry:
2078 an R_386_32 relocation for the GOT entry, and an R_386_32
2079 relocation for the PLT entry. */
2080
2081 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2082 }
2083 }
2084 else
2085 {
2086 h->plt.offset = (bfd_vma) -1;
2087 h->needs_plt = 0;
2088 }
2089 }
2090 else
2091 {
2092 h->plt.offset = (bfd_vma) -1;
2093 h->needs_plt = 0;
2094 }
2095
2096 eh->tlsdesc_got = (bfd_vma) -1;
2097
2098 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2099 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2100 if (h->got.refcount > 0
2101 && !info->shared
2102 && h->dynindx == -1
2103 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2104 h->got.offset = (bfd_vma) -1;
2105 else if (h->got.refcount > 0)
2106 {
2107 asection *s;
2108 bfd_boolean dyn;
2109 int tls_type = elf_i386_hash_entry(h)->tls_type;
2110
2111 /* Make sure this symbol is output as a dynamic symbol.
2112 Undefined weak syms won't yet be marked as dynamic. */
2113 if (h->dynindx == -1
2114 && !h->forced_local)
2115 {
2116 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2117 return FALSE;
2118 }
2119
2120 s = htab->elf.sgot;
2121 if (GOT_TLS_GDESC_P (tls_type))
2122 {
2123 eh->tlsdesc_got = htab->elf.sgotplt->size
2124 - elf_i386_compute_jump_table_size (htab);
2125 htab->elf.sgotplt->size += 8;
2126 h->got.offset = (bfd_vma) -2;
2127 }
2128 if (! GOT_TLS_GDESC_P (tls_type)
2129 || GOT_TLS_GD_P (tls_type))
2130 {
2131 h->got.offset = s->size;
2132 s->size += 4;
2133 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2134 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2135 s->size += 4;
2136 }
2137 dyn = htab->elf.dynamic_sections_created;
2138 /* R_386_TLS_IE_32 needs one dynamic relocation,
2139 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2140 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2141 need two), R_386_TLS_GD needs one if local symbol and two if
2142 global. */
2143 if (tls_type == GOT_TLS_IE_BOTH)
2144 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2145 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2146 || (tls_type & GOT_TLS_IE))
2147 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2148 else if (GOT_TLS_GD_P (tls_type))
2149 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2150 else if (! GOT_TLS_GDESC_P (tls_type)
2151 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2152 || h->root.type != bfd_link_hash_undefweak)
2153 && (info->shared
2154 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2155 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2156 if (GOT_TLS_GDESC_P (tls_type))
2157 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2158 }
2159 else
2160 h->got.offset = (bfd_vma) -1;
2161
2162 if (eh->dyn_relocs == NULL)
2163 return TRUE;
2164
2165 /* In the shared -Bsymbolic case, discard space allocated for
2166 dynamic pc-relative relocs against symbols which turn out to be
2167 defined in regular objects. For the normal shared case, discard
2168 space for pc-relative relocs that have become local due to symbol
2169 visibility changes. */
2170
2171 if (info->shared)
2172 {
2173 /* The only reloc that uses pc_count is R_386_PC32, which will
2174 appear on a call or on something like ".long foo - .". We
2175 want calls to protected symbols to resolve directly to the
2176 function rather than going via the plt. If people want
2177 function pointer comparisons to work as expected then they
2178 should avoid writing assembly like ".long foo - .". */
2179 if (SYMBOL_CALLS_LOCAL (info, h))
2180 {
2181 struct elf_dyn_relocs **pp;
2182
2183 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2184 {
2185 p->count -= p->pc_count;
2186 p->pc_count = 0;
2187 if (p->count == 0)
2188 *pp = p->next;
2189 else
2190 pp = &p->next;
2191 }
2192 }
2193
2194 if (htab->is_vxworks)
2195 {
2196 struct elf_dyn_relocs **pp;
2197 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2198 {
2199 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2200 *pp = p->next;
2201 else
2202 pp = &p->next;
2203 }
2204 }
2205
2206 /* Also discard relocs on undefined weak syms with non-default
2207 visibility. */
2208 if (eh->dyn_relocs != NULL
2209 && h->root.type == bfd_link_hash_undefweak)
2210 {
2211 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2212 eh->dyn_relocs = NULL;
2213
2214 /* Make sure undefined weak symbols are output as a dynamic
2215 symbol in PIEs. */
2216 else if (h->dynindx == -1
2217 && !h->forced_local)
2218 {
2219 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2220 return FALSE;
2221 }
2222 }
2223 }
2224 else if (ELIMINATE_COPY_RELOCS)
2225 {
2226 /* For the non-shared case, discard space for relocs against
2227 symbols which turn out to need copy relocs or are not
2228 dynamic. */
2229
2230 if (!h->non_got_ref
2231 && ((h->def_dynamic
2232 && !h->def_regular)
2233 || (htab->elf.dynamic_sections_created
2234 && (h->root.type == bfd_link_hash_undefweak
2235 || h->root.type == bfd_link_hash_undefined))))
2236 {
2237 /* Make sure this symbol is output as a dynamic symbol.
2238 Undefined weak syms won't yet be marked as dynamic. */
2239 if (h->dynindx == -1
2240 && !h->forced_local)
2241 {
2242 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2243 return FALSE;
2244 }
2245
2246 /* If that succeeded, we know we'll be keeping all the
2247 relocs. */
2248 if (h->dynindx != -1)
2249 goto keep;
2250 }
2251
2252 eh->dyn_relocs = NULL;
2253
2254 keep: ;
2255 }
2256
2257 /* Finally, allocate space. */
2258 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2259 {
2260 asection *sreloc;
2261
2262 sreloc = elf_section_data (p->sec)->sreloc;
2263
2264 BFD_ASSERT (sreloc != NULL);
2265 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2266 }
2267
2268 return TRUE;
2269 }
2270
2271 /* Allocate space in .plt, .got and associated reloc sections for
2272 local dynamic relocs. */
2273
2274 static bfd_boolean
2275 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2276 {
2277 struct elf_link_hash_entry *h
2278 = (struct elf_link_hash_entry *) *slot;
2279
2280 if (h->type != STT_GNU_IFUNC
2281 || !h->def_regular
2282 || !h->ref_regular
2283 || !h->forced_local
2284 || h->root.type != bfd_link_hash_defined)
2285 abort ();
2286
2287 return elf_i386_allocate_dynrelocs (h, inf);
2288 }
2289
2290 /* Find any dynamic relocs that apply to read-only sections. */
2291
2292 static bfd_boolean
2293 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2294 {
2295 struct elf_i386_link_hash_entry *eh;
2296 struct elf_dyn_relocs *p;
2297
2298 if (h->root.type == bfd_link_hash_warning)
2299 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2300
2301 eh = (struct elf_i386_link_hash_entry *) h;
2302 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2303 {
2304 asection *s = p->sec->output_section;
2305
2306 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2307 {
2308 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2309
2310 info->flags |= DF_TEXTREL;
2311
2312 /* Not an error, just cut short the traversal. */
2313 return FALSE;
2314 }
2315 }
2316 return TRUE;
2317 }
2318
2319 /* Set the sizes of the dynamic sections. */
2320
2321 static bfd_boolean
2322 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2323 struct bfd_link_info *info)
2324 {
2325 struct elf_i386_link_hash_table *htab;
2326 bfd *dynobj;
2327 asection *s;
2328 bfd_boolean relocs;
2329 bfd *ibfd;
2330
2331 htab = elf_i386_hash_table (info);
2332 dynobj = htab->elf.dynobj;
2333 if (dynobj == NULL)
2334 abort ();
2335
2336 if (htab->elf.dynamic_sections_created)
2337 {
2338 /* Set the contents of the .interp section to the interpreter. */
2339 if (info->executable)
2340 {
2341 s = bfd_get_section_by_name (dynobj, ".interp");
2342 if (s == NULL)
2343 abort ();
2344 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2345 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2346 }
2347 }
2348
2349 /* Set up .got offsets for local syms, and space for local dynamic
2350 relocs. */
2351 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2352 {
2353 bfd_signed_vma *local_got;
2354 bfd_signed_vma *end_local_got;
2355 char *local_tls_type;
2356 bfd_vma *local_tlsdesc_gotent;
2357 bfd_size_type locsymcount;
2358 Elf_Internal_Shdr *symtab_hdr;
2359 asection *srel;
2360
2361 if (! is_i386_elf (ibfd))
2362 continue;
2363
2364 for (s = ibfd->sections; s != NULL; s = s->next)
2365 {
2366 struct elf_dyn_relocs *p;
2367
2368 for (p = ((struct elf_dyn_relocs *)
2369 elf_section_data (s)->local_dynrel);
2370 p != NULL;
2371 p = p->next)
2372 {
2373 if (!bfd_is_abs_section (p->sec)
2374 && bfd_is_abs_section (p->sec->output_section))
2375 {
2376 /* Input section has been discarded, either because
2377 it is a copy of a linkonce section or due to
2378 linker script /DISCARD/, so we'll be discarding
2379 the relocs too. */
2380 }
2381 else if (htab->is_vxworks
2382 && strcmp (p->sec->output_section->name,
2383 ".tls_vars") == 0)
2384 {
2385 /* Relocations in vxworks .tls_vars sections are
2386 handled specially by the loader. */
2387 }
2388 else if (p->count != 0)
2389 {
2390 srel = elf_section_data (p->sec)->sreloc;
2391 srel->size += p->count * sizeof (Elf32_External_Rel);
2392 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2393 info->flags |= DF_TEXTREL;
2394 }
2395 }
2396 }
2397
2398 local_got = elf_local_got_refcounts (ibfd);
2399 if (!local_got)
2400 continue;
2401
2402 symtab_hdr = &elf_symtab_hdr (ibfd);
2403 locsymcount = symtab_hdr->sh_info;
2404 end_local_got = local_got + locsymcount;
2405 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2406 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2407 s = htab->elf.sgot;
2408 srel = htab->elf.srelgot;
2409 for (; local_got < end_local_got;
2410 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2411 {
2412 *local_tlsdesc_gotent = (bfd_vma) -1;
2413 if (*local_got > 0)
2414 {
2415 if (GOT_TLS_GDESC_P (*local_tls_type))
2416 {
2417 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2418 - elf_i386_compute_jump_table_size (htab);
2419 htab->elf.sgotplt->size += 8;
2420 *local_got = (bfd_vma) -2;
2421 }
2422 if (! GOT_TLS_GDESC_P (*local_tls_type)
2423 || GOT_TLS_GD_P (*local_tls_type))
2424 {
2425 *local_got = s->size;
2426 s->size += 4;
2427 if (GOT_TLS_GD_P (*local_tls_type)
2428 || *local_tls_type == GOT_TLS_IE_BOTH)
2429 s->size += 4;
2430 }
2431 if (info->shared
2432 || GOT_TLS_GD_ANY_P (*local_tls_type)
2433 || (*local_tls_type & GOT_TLS_IE))
2434 {
2435 if (*local_tls_type == GOT_TLS_IE_BOTH)
2436 srel->size += 2 * sizeof (Elf32_External_Rel);
2437 else if (GOT_TLS_GD_P (*local_tls_type)
2438 || ! GOT_TLS_GDESC_P (*local_tls_type))
2439 srel->size += sizeof (Elf32_External_Rel);
2440 if (GOT_TLS_GDESC_P (*local_tls_type))
2441 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2442 }
2443 }
2444 else
2445 *local_got = (bfd_vma) -1;
2446 }
2447 }
2448
2449 if (htab->tls_ldm_got.refcount > 0)
2450 {
2451 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2452 relocs. */
2453 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2454 htab->elf.sgot->size += 8;
2455 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2456 }
2457 else
2458 htab->tls_ldm_got.offset = -1;
2459
2460 /* Allocate global sym .plt and .got entries, and space for global
2461 sym dynamic relocs. */
2462 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2463
2464 /* Allocate .plt and .got entries, and space for local symbols. */
2465 htab_traverse (htab->loc_hash_table,
2466 elf_i386_allocate_local_dynrelocs,
2467 info);
2468
2469 /* For every jump slot reserved in the sgotplt, reloc_count is
2470 incremented. However, when we reserve space for TLS descriptors,
2471 it's not incremented, so in order to compute the space reserved
2472 for them, it suffices to multiply the reloc count by the jump
2473 slot size. */
2474 if (htab->elf.srelplt)
2475 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2476
2477 /* We now have determined the sizes of the various dynamic sections.
2478 Allocate memory for them. */
2479 relocs = FALSE;
2480 for (s = dynobj->sections; s != NULL; s = s->next)
2481 {
2482 bfd_boolean strip_section = TRUE;
2483
2484 if ((s->flags & SEC_LINKER_CREATED) == 0)
2485 continue;
2486
2487 if (s == htab->elf.splt
2488 || s == htab->elf.sgot
2489 || s == htab->elf.sgotplt
2490 || s == htab->elf.iplt
2491 || s == htab->elf.igotplt
2492 || s == htab->sdynbss)
2493 {
2494 /* Strip this section if we don't need it; see the
2495 comment below. */
2496 /* We'd like to strip these sections if they aren't needed, but if
2497 we've exported dynamic symbols from them we must leave them.
2498 It's too late to tell BFD to get rid of the symbols. */
2499
2500 if (htab->elf.hplt != NULL)
2501 strip_section = FALSE;
2502 }
2503 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2504 {
2505 if (s->size != 0
2506 && s != htab->elf.srelplt
2507 && s != htab->srelplt2)
2508 relocs = TRUE;
2509
2510 /* We use the reloc_count field as a counter if we need
2511 to copy relocs into the output file. */
2512 s->reloc_count = 0;
2513 }
2514 else
2515 {
2516 /* It's not one of our sections, so don't allocate space. */
2517 continue;
2518 }
2519
2520 if (s->size == 0)
2521 {
2522 /* If we don't need this section, strip it from the
2523 output file. This is mostly to handle .rel.bss and
2524 .rel.plt. We must create both sections in
2525 create_dynamic_sections, because they must be created
2526 before the linker maps input sections to output
2527 sections. The linker does that before
2528 adjust_dynamic_symbol is called, and it is that
2529 function which decides whether anything needs to go
2530 into these sections. */
2531 if (strip_section)
2532 s->flags |= SEC_EXCLUDE;
2533 continue;
2534 }
2535
2536 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2537 continue;
2538
2539 /* Allocate memory for the section contents. We use bfd_zalloc
2540 here in case unused entries are not reclaimed before the
2541 section's contents are written out. This should not happen,
2542 but this way if it does, we get a R_386_NONE reloc instead
2543 of garbage. */
2544 s->contents = bfd_zalloc (dynobj, s->size);
2545 if (s->contents == NULL)
2546 return FALSE;
2547 }
2548
2549 if (htab->elf.dynamic_sections_created)
2550 {
2551 /* Add some entries to the .dynamic section. We fill in the
2552 values later, in elf_i386_finish_dynamic_sections, but we
2553 must add the entries now so that we get the correct size for
2554 the .dynamic section. The DT_DEBUG entry is filled in by the
2555 dynamic linker and used by the debugger. */
2556 #define add_dynamic_entry(TAG, VAL) \
2557 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2558
2559 if (info->executable)
2560 {
2561 if (!add_dynamic_entry (DT_DEBUG, 0))
2562 return FALSE;
2563 }
2564
2565 if (htab->elf.splt->size != 0)
2566 {
2567 if (!add_dynamic_entry (DT_PLTGOT, 0)
2568 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2569 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2570 || !add_dynamic_entry (DT_JMPREL, 0))
2571 return FALSE;
2572 }
2573
2574 if (relocs)
2575 {
2576 if (!add_dynamic_entry (DT_REL, 0)
2577 || !add_dynamic_entry (DT_RELSZ, 0)
2578 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2579 return FALSE;
2580
2581 /* If any dynamic relocs apply to a read-only section,
2582 then we need a DT_TEXTREL entry. */
2583 if ((info->flags & DF_TEXTREL) == 0)
2584 elf_link_hash_traverse (&htab->elf,
2585 elf_i386_readonly_dynrelocs, info);
2586
2587 if ((info->flags & DF_TEXTREL) != 0)
2588 {
2589 if (!add_dynamic_entry (DT_TEXTREL, 0))
2590 return FALSE;
2591 }
2592 }
2593 if (htab->is_vxworks
2594 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2595 return FALSE;
2596 }
2597 #undef add_dynamic_entry
2598
2599 return TRUE;
2600 }
2601
2602 static bfd_boolean
2603 elf_i386_always_size_sections (bfd *output_bfd,
2604 struct bfd_link_info *info)
2605 {
2606 asection *tls_sec = elf_hash_table (info)->tls_sec;
2607
2608 if (tls_sec)
2609 {
2610 struct elf_link_hash_entry *tlsbase;
2611
2612 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2613 "_TLS_MODULE_BASE_",
2614 FALSE, FALSE, FALSE);
2615
2616 if (tlsbase && tlsbase->type == STT_TLS)
2617 {
2618 struct bfd_link_hash_entry *bh = NULL;
2619 const struct elf_backend_data *bed
2620 = get_elf_backend_data (output_bfd);
2621
2622 if (!(_bfd_generic_link_add_one_symbol
2623 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2624 tls_sec, 0, NULL, FALSE,
2625 bed->collect, &bh)))
2626 return FALSE;
2627
2628 elf_i386_hash_table (info)->tls_module_base = bh;
2629
2630 tlsbase = (struct elf_link_hash_entry *)bh;
2631 tlsbase->def_regular = 1;
2632 tlsbase->other = STV_HIDDEN;
2633 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2634 }
2635 }
2636
2637 return TRUE;
2638 }
2639
2640 /* Set the correct type for an x86 ELF section. We do this by the
2641 section name, which is a hack, but ought to work. */
2642
2643 static bfd_boolean
2644 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2645 Elf_Internal_Shdr *hdr,
2646 asection *sec)
2647 {
2648 register const char *name;
2649
2650 name = bfd_get_section_name (abfd, sec);
2651
2652 /* This is an ugly, but unfortunately necessary hack that is
2653 needed when producing EFI binaries on x86. It tells
2654 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2655 containing ELF relocation info. We need this hack in order to
2656 be able to generate ELF binaries that can be translated into
2657 EFI applications (which are essentially COFF objects). Those
2658 files contain a COFF ".reloc" section inside an ELFNN object,
2659 which would normally cause BFD to segfault because it would
2660 attempt to interpret this section as containing relocation
2661 entries for section "oc". With this hack enabled, ".reloc"
2662 will be treated as a normal data section, which will avoid the
2663 segfault. However, you won't be able to create an ELFNN binary
2664 with a section named "oc" that needs relocations, but that's
2665 the kind of ugly side-effects you get when detecting section
2666 types based on their names... In practice, this limitation is
2667 unlikely to bite. */
2668 if (strcmp (name, ".reloc") == 0)
2669 hdr->sh_type = SHT_PROGBITS;
2670
2671 return TRUE;
2672 }
2673
2674 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2675 executables. Rather than setting it to the beginning of the TLS
2676 section, we have to set it to the end. This function may be called
2677 multiple times, it is idempotent. */
2678
2679 static void
2680 elf_i386_set_tls_module_base (struct bfd_link_info *info)
2681 {
2682 struct bfd_link_hash_entry *base;
2683
2684 if (!info->executable)
2685 return;
2686
2687 base = elf_i386_hash_table (info)->tls_module_base;
2688
2689 if (!base)
2690 return;
2691
2692 base->u.def.value = elf_hash_table (info)->tls_size;
2693 }
2694
2695 /* Return the base VMA address which should be subtracted from real addresses
2696 when resolving @dtpoff relocation.
2697 This is PT_TLS segment p_vaddr. */
2698
2699 static bfd_vma
2700 elf_i386_dtpoff_base (struct bfd_link_info *info)
2701 {
2702 /* If tls_sec is NULL, we should have signalled an error already. */
2703 if (elf_hash_table (info)->tls_sec == NULL)
2704 return 0;
2705 return elf_hash_table (info)->tls_sec->vma;
2706 }
2707
2708 /* Return the relocation value for @tpoff relocation
2709 if STT_TLS virtual address is ADDRESS. */
2710
2711 static bfd_vma
2712 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2713 {
2714 struct elf_link_hash_table *htab = elf_hash_table (info);
2715
2716 /* If tls_sec is NULL, we should have signalled an error already. */
2717 if (htab->tls_sec == NULL)
2718 return 0;
2719 return htab->tls_size + htab->tls_sec->vma - address;
2720 }
2721
2722 /* Relocate an i386 ELF section. */
2723
2724 static bfd_boolean
2725 elf_i386_relocate_section (bfd *output_bfd,
2726 struct bfd_link_info *info,
2727 bfd *input_bfd,
2728 asection *input_section,
2729 bfd_byte *contents,
2730 Elf_Internal_Rela *relocs,
2731 Elf_Internal_Sym *local_syms,
2732 asection **local_sections)
2733 {
2734 struct elf_i386_link_hash_table *htab;
2735 Elf_Internal_Shdr *symtab_hdr;
2736 struct elf_link_hash_entry **sym_hashes;
2737 bfd_vma *local_got_offsets;
2738 bfd_vma *local_tlsdesc_gotents;
2739 Elf_Internal_Rela *rel;
2740 Elf_Internal_Rela *relend;
2741 bfd_boolean is_vxworks_tls;
2742
2743 BFD_ASSERT (is_i386_elf (input_bfd));
2744
2745 htab = elf_i386_hash_table (info);
2746 symtab_hdr = &elf_symtab_hdr (input_bfd);
2747 sym_hashes = elf_sym_hashes (input_bfd);
2748 local_got_offsets = elf_local_got_offsets (input_bfd);
2749 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2750 /* We have to handle relocations in vxworks .tls_vars sections
2751 specially, because the dynamic loader is 'weird'. */
2752 is_vxworks_tls = (htab->is_vxworks && info->shared
2753 && !strcmp (input_section->output_section->name,
2754 ".tls_vars"));
2755
2756 elf_i386_set_tls_module_base (info);
2757
2758 rel = relocs;
2759 relend = relocs + input_section->reloc_count;
2760 for (; rel < relend; rel++)
2761 {
2762 unsigned int r_type;
2763 reloc_howto_type *howto;
2764 unsigned long r_symndx;
2765 struct elf_link_hash_entry *h;
2766 Elf_Internal_Sym *sym;
2767 asection *sec;
2768 bfd_vma off, offplt;
2769 bfd_vma relocation;
2770 bfd_boolean unresolved_reloc;
2771 bfd_reloc_status_type r;
2772 unsigned int indx;
2773 int tls_type;
2774
2775 r_type = ELF32_R_TYPE (rel->r_info);
2776 if (r_type == R_386_GNU_VTINHERIT
2777 || r_type == R_386_GNU_VTENTRY)
2778 continue;
2779
2780 if ((indx = r_type) >= R_386_standard
2781 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2782 >= R_386_ext - R_386_standard)
2783 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2784 >= R_386_irelative - R_386_ext))
2785 {
2786 (*_bfd_error_handler)
2787 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2788 input_bfd, input_section, r_type);
2789 bfd_set_error (bfd_error_bad_value);
2790 return FALSE;
2791 }
2792 howto = elf_howto_table + indx;
2793
2794 r_symndx = ELF32_R_SYM (rel->r_info);
2795 h = NULL;
2796 sym = NULL;
2797 sec = NULL;
2798 unresolved_reloc = FALSE;
2799 if (r_symndx < symtab_hdr->sh_info)
2800 {
2801 sym = local_syms + r_symndx;
2802 sec = local_sections[r_symndx];
2803 relocation = (sec->output_section->vma
2804 + sec->output_offset
2805 + sym->st_value);
2806
2807 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2808 && ((sec->flags & SEC_MERGE) != 0
2809 || (info->relocatable
2810 && sec->output_offset != 0)))
2811 {
2812 bfd_vma addend;
2813 bfd_byte *where = contents + rel->r_offset;
2814
2815 switch (howto->size)
2816 {
2817 case 0:
2818 addend = bfd_get_8 (input_bfd, where);
2819 if (howto->pc_relative)
2820 {
2821 addend = (addend ^ 0x80) - 0x80;
2822 addend += 1;
2823 }
2824 break;
2825 case 1:
2826 addend = bfd_get_16 (input_bfd, where);
2827 if (howto->pc_relative)
2828 {
2829 addend = (addend ^ 0x8000) - 0x8000;
2830 addend += 2;
2831 }
2832 break;
2833 case 2:
2834 addend = bfd_get_32 (input_bfd, where);
2835 if (howto->pc_relative)
2836 {
2837 addend = (addend ^ 0x80000000) - 0x80000000;
2838 addend += 4;
2839 }
2840 break;
2841 default:
2842 abort ();
2843 }
2844
2845 if (info->relocatable)
2846 addend += sec->output_offset;
2847 else
2848 {
2849 asection *msec = sec;
2850 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2851 addend);
2852 addend -= relocation;
2853 addend += msec->output_section->vma + msec->output_offset;
2854 }
2855
2856 switch (howto->size)
2857 {
2858 case 0:
2859 /* FIXME: overflow checks. */
2860 if (howto->pc_relative)
2861 addend -= 1;
2862 bfd_put_8 (input_bfd, addend, where);
2863 break;
2864 case 1:
2865 if (howto->pc_relative)
2866 addend -= 2;
2867 bfd_put_16 (input_bfd, addend, where);
2868 break;
2869 case 2:
2870 if (howto->pc_relative)
2871 addend -= 4;
2872 bfd_put_32 (input_bfd, addend, where);
2873 break;
2874 }
2875 }
2876 else if (ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2877 {
2878 /* Relocate against local STT_GNU_IFUNC symbol. */
2879 h = elf_i386_get_local_sym_hash (htab, input_bfd,
2880 rel, FALSE);
2881 if (h == NULL)
2882 abort ();
2883
2884 /* Set STT_GNU_IFUNC symbol value. */
2885 h->root.u.def.value = sym->st_value;
2886 h->root.u.def.section = sec;
2887 }
2888 }
2889 else
2890 {
2891 bfd_boolean warned;
2892
2893 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2894 r_symndx, symtab_hdr, sym_hashes,
2895 h, sec, relocation,
2896 unresolved_reloc, warned);
2897 }
2898
2899 if (sec != NULL && elf_discarded_section (sec))
2900 {
2901 /* For relocs against symbols from removed linkonce sections,
2902 or sections discarded by a linker script, we just want the
2903 section contents zeroed. Avoid any special processing. */
2904 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2905 rel->r_info = 0;
2906 rel->r_addend = 0;
2907 continue;
2908 }
2909
2910 if (info->relocatable)
2911 continue;
2912
2913 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2914 it here if it is defined in a non-shared object. */
2915 if (h != NULL
2916 && h->type == STT_GNU_IFUNC
2917 && h->def_regular)
2918 {
2919 asection *plt, *gotplt, *base_got;
2920 bfd_vma plt_index;
2921
2922 if ((input_section->flags & SEC_ALLOC) == 0
2923 || h->plt.offset == (bfd_vma) -1)
2924 abort ();
2925
2926 /* STT_GNU_IFUNC symbol must go through PLT. */
2927 if (htab->elf.splt != NULL)
2928 {
2929 plt = htab->elf.splt;
2930 gotplt = htab->elf.sgotplt;
2931 }
2932 else
2933 {
2934 plt = htab->elf.iplt;
2935 gotplt = htab->elf.igotplt;
2936 }
2937
2938 relocation = (plt->output_section->vma
2939 + plt->output_offset + h->plt.offset);
2940
2941 switch (r_type)
2942 {
2943 default:
2944 (*_bfd_error_handler)
2945 (_("%B: relocation %s against STT_GNU_IFUNC "
2946 "symbol `%s' isn't handled by %s"), input_bfd,
2947 elf_howto_table[r_type].name,
2948 (h->root.root.string
2949 ? h->root.root.string : "a local symbol"),
2950 __FUNCTION__);
2951 bfd_set_error (bfd_error_bad_value);
2952 return FALSE;
2953
2954 case R_386_32:
2955 /* Generate dynamic relcoation only when there is a
2956 non-GOF reference in a shared object. */
2957 if (info->shared && h->non_got_ref)
2958 {
2959 Elf_Internal_Rela outrel;
2960 bfd_byte *loc;
2961 asection *sreloc;
2962 bfd_vma offset;
2963
2964 /* Need a dynamic relocation to get the real function
2965 adddress. */
2966 offset = _bfd_elf_section_offset (output_bfd,
2967 info,
2968 input_section,
2969 rel->r_offset);
2970 if (offset == (bfd_vma) -1
2971 || offset == (bfd_vma) -2)
2972 abort ();
2973
2974 outrel.r_offset = (input_section->output_section->vma
2975 + input_section->output_offset
2976 + offset);
2977
2978 if (h->dynindx == -1
2979 || h->forced_local
2980 || info->executable)
2981 {
2982 /* This symbol is resolved locally. */
2983 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2984 bfd_put_32 (output_bfd,
2985 (h->root.u.def.value
2986 + h->root.u.def.section->output_section->vma
2987 + h->root.u.def.section->output_offset),
2988 contents + offset);
2989 }
2990 else
2991 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2992
2993 sreloc = htab->elf.irelifunc;
2994 loc = sreloc->contents;
2995 loc += (sreloc->reloc_count++
2996 * sizeof (Elf32_External_Rel));
2997 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2998
2999 /* If this reloc is against an external symbol, we
3000 do not want to fiddle with the addend. Otherwise,
3001 we need to include the symbol value so that it
3002 becomes an addend for the dynamic reloc. For an
3003 internal symbol, we have updated addend. */
3004 continue;
3005 }
3006
3007 case R_386_PC32:
3008 case R_386_PLT32:
3009 goto do_relocation;
3010
3011 case R_386_GOT32:
3012 base_got = htab->elf.sgot;
3013 off = h->got.offset;
3014
3015 if (base_got == NULL)
3016 abort ();
3017
3018 if (off == (bfd_vma) -1)
3019 {
3020 /* We can't use h->got.offset here to save state, or
3021 even just remember the offset, as finish_dynamic_symbol
3022 would use that as offset into .got. */
3023
3024 if (htab->elf.splt != NULL)
3025 {
3026 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3027 off = (plt_index + 3) * 4;
3028 base_got = htab->elf.sgotplt;
3029 }
3030 else
3031 {
3032 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3033 off = plt_index * 4;
3034 base_got = htab->elf.igotplt;
3035 }
3036
3037 if (h->dynindx == -1
3038 || h->forced_local
3039 || info->symbolic)
3040 {
3041 /* This references the local defitionion. We must
3042 initialize this entry in the global offset table.
3043 Since the offset must always be a multiple of 8,
3044 we use the least significant bit to record
3045 whether we have initialized it already.
3046
3047 When doing a dynamic link, we create a .rela.got
3048 relocation entry to initialize the value. This
3049 is done in the finish_dynamic_symbol routine. */
3050 if ((off & 1) != 0)
3051 off &= ~1;
3052 else
3053 {
3054 bfd_put_32 (output_bfd, relocation,
3055 base_got->contents + off);
3056 h->got.offset |= 1;
3057 }
3058 }
3059
3060 relocation = off;
3061
3062 /* Adjust for static executables. */
3063 if (htab->elf.splt == NULL)
3064 relocation += gotplt->output_offset;
3065 }
3066 else
3067 {
3068 relocation = (base_got->output_section->vma
3069 + base_got->output_offset + off
3070 - gotplt->output_section->vma
3071 - gotplt->output_offset);
3072 /* Adjust for static executables. */
3073 if (htab->elf.splt == NULL)
3074 relocation += gotplt->output_offset;
3075 }
3076
3077 goto do_relocation;
3078
3079 case R_386_GOTOFF:
3080 relocation -= (gotplt->output_section->vma
3081 + gotplt->output_offset);
3082 goto do_relocation;
3083 }
3084 }
3085
3086 switch (r_type)
3087 {
3088 case R_386_GOT32:
3089 /* Relocation is to the entry for this symbol in the global
3090 offset table. */
3091 if (htab->elf.sgot == NULL)
3092 abort ();
3093
3094 if (h != NULL)
3095 {
3096 bfd_boolean dyn;
3097
3098 off = h->got.offset;
3099 dyn = htab->elf.dynamic_sections_created;
3100 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3101 || (info->shared
3102 && SYMBOL_REFERENCES_LOCAL (info, h))
3103 || (ELF_ST_VISIBILITY (h->other)
3104 && h->root.type == bfd_link_hash_undefweak))
3105 {
3106 /* This is actually a static link, or it is a
3107 -Bsymbolic link and the symbol is defined
3108 locally, or the symbol was forced to be local
3109 because of a version file. We must initialize
3110 this entry in the global offset table. Since the
3111 offset must always be a multiple of 4, we use the
3112 least significant bit to record whether we have
3113 initialized it already.
3114
3115 When doing a dynamic link, we create a .rel.got
3116 relocation entry to initialize the value. This
3117 is done in the finish_dynamic_symbol routine. */
3118 if ((off & 1) != 0)
3119 off &= ~1;
3120 else
3121 {
3122 bfd_put_32 (output_bfd, relocation,
3123 htab->elf.sgot->contents + off);
3124 h->got.offset |= 1;
3125 }
3126 }
3127 else
3128 unresolved_reloc = FALSE;
3129 }
3130 else
3131 {
3132 if (local_got_offsets == NULL)
3133 abort ();
3134
3135 off = local_got_offsets[r_symndx];
3136
3137 /* The offset must always be a multiple of 4. We use
3138 the least significant bit to record whether we have
3139 already generated the necessary reloc. */
3140 if ((off & 1) != 0)
3141 off &= ~1;
3142 else
3143 {
3144 bfd_put_32 (output_bfd, relocation,
3145 htab->elf.sgot->contents + off);
3146
3147 if (info->shared)
3148 {
3149 asection *s;
3150 Elf_Internal_Rela outrel;
3151 bfd_byte *loc;
3152
3153 s = htab->elf.srelgot;
3154 if (s == NULL)
3155 abort ();
3156
3157 outrel.r_offset = (htab->elf.sgot->output_section->vma
3158 + htab->elf.sgot->output_offset
3159 + off);
3160 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3161 loc = s->contents;
3162 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
3163 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3164 }
3165
3166 local_got_offsets[r_symndx] |= 1;
3167 }
3168 }
3169
3170 if (off >= (bfd_vma) -2)
3171 abort ();
3172
3173 relocation = htab->elf.sgot->output_section->vma
3174 + htab->elf.sgot->output_offset + off
3175 - htab->elf.sgotplt->output_section->vma
3176 - htab->elf.sgotplt->output_offset;
3177 break;
3178
3179 case R_386_GOTOFF:
3180 /* Relocation is relative to the start of the global offset
3181 table. */
3182
3183 /* Check to make sure it isn't a protected function symbol
3184 for shared library since it may not be local when used
3185 as function address. We also need to make sure that a
3186 symbol is defined locally. */
3187 if (info->shared && h)
3188 {
3189 if (!h->def_regular)
3190 {
3191 const char *v;
3192
3193 switch (ELF_ST_VISIBILITY (h->other))
3194 {
3195 case STV_HIDDEN:
3196 v = _("hidden symbol");
3197 break;
3198 case STV_INTERNAL:
3199 v = _("internal symbol");
3200 break;
3201 case STV_PROTECTED:
3202 v = _("protected symbol");
3203 break;
3204 default:
3205 v = _("symbol");
3206 break;
3207 }
3208
3209 (*_bfd_error_handler)
3210 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3211 input_bfd, v, h->root.root.string);
3212 bfd_set_error (bfd_error_bad_value);
3213 return FALSE;
3214 }
3215 else if (!info->executable
3216 && h->type == STT_FUNC
3217 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3218 {
3219 (*_bfd_error_handler)
3220 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3221 input_bfd, h->root.root.string);
3222 bfd_set_error (bfd_error_bad_value);
3223 return FALSE;
3224 }
3225 }
3226
3227 /* Note that sgot is not involved in this
3228 calculation. We always want the start of .got.plt. If we
3229 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3230 permitted by the ABI, we might have to change this
3231 calculation. */
3232 relocation -= htab->elf.sgotplt->output_section->vma
3233 + htab->elf.sgotplt->output_offset;
3234 break;
3235
3236 case R_386_GOTPC:
3237 /* Use global offset table as symbol value. */
3238 relocation = htab->elf.sgotplt->output_section->vma
3239 + htab->elf.sgotplt->output_offset;
3240 unresolved_reloc = FALSE;
3241 break;
3242
3243 case R_386_PLT32:
3244 /* Relocation is to the entry for this symbol in the
3245 procedure linkage table. */
3246
3247 /* Resolve a PLT32 reloc against a local symbol directly,
3248 without using the procedure linkage table. */
3249 if (h == NULL)
3250 break;
3251
3252 if (h->plt.offset == (bfd_vma) -1
3253 || htab->elf.splt == NULL)
3254 {
3255 /* We didn't make a PLT entry for this symbol. This
3256 happens when statically linking PIC code, or when
3257 using -Bsymbolic. */
3258 break;
3259 }
3260
3261 relocation = (htab->elf.splt->output_section->vma
3262 + htab->elf.splt->output_offset
3263 + h->plt.offset);
3264 unresolved_reloc = FALSE;
3265 break;
3266
3267 case R_386_32:
3268 case R_386_PC32:
3269 if ((input_section->flags & SEC_ALLOC) == 0
3270 || is_vxworks_tls)
3271 break;
3272
3273 if ((info->shared
3274 && (h == NULL
3275 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3276 || h->root.type != bfd_link_hash_undefweak)
3277 && (r_type != R_386_PC32
3278 || !SYMBOL_CALLS_LOCAL (info, h)))
3279 || (ELIMINATE_COPY_RELOCS
3280 && !info->shared
3281 && h != NULL
3282 && h->dynindx != -1
3283 && !h->non_got_ref
3284 && ((h->def_dynamic
3285 && !h->def_regular)
3286 || h->root.type == bfd_link_hash_undefweak
3287 || h->root.type == bfd_link_hash_undefined)))
3288 {
3289 Elf_Internal_Rela outrel;
3290 bfd_byte *loc;
3291 bfd_boolean skip, relocate;
3292 asection *sreloc;
3293
3294 /* When generating a shared object, these relocations
3295 are copied into the output file to be resolved at run
3296 time. */
3297
3298 skip = FALSE;
3299 relocate = FALSE;
3300
3301 outrel.r_offset =
3302 _bfd_elf_section_offset (output_bfd, info, input_section,
3303 rel->r_offset);
3304 if (outrel.r_offset == (bfd_vma) -1)
3305 skip = TRUE;
3306 else if (outrel.r_offset == (bfd_vma) -2)
3307 skip = TRUE, relocate = TRUE;
3308 outrel.r_offset += (input_section->output_section->vma
3309 + input_section->output_offset);
3310
3311 if (skip)
3312 memset (&outrel, 0, sizeof outrel);
3313 else if (h != NULL
3314 && h->dynindx != -1
3315 && (r_type == R_386_PC32
3316 || !info->shared
3317 || !SYMBOLIC_BIND (info, h)
3318 || !h->def_regular))
3319 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3320 else
3321 {
3322 /* This symbol is local, or marked to become local. */
3323 relocate = TRUE;
3324 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3325 }
3326
3327 sreloc = elf_section_data (input_section)->sreloc;
3328
3329 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3330
3331 loc = sreloc->contents;
3332 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3333
3334 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3335
3336 /* If this reloc is against an external symbol, we do
3337 not want to fiddle with the addend. Otherwise, we
3338 need to include the symbol value so that it becomes
3339 an addend for the dynamic reloc. */
3340 if (! relocate)
3341 continue;
3342 }
3343 break;
3344
3345 case R_386_TLS_IE:
3346 if (info->shared)
3347 {
3348 Elf_Internal_Rela outrel;
3349 bfd_byte *loc;
3350 asection *sreloc;
3351
3352 outrel.r_offset = rel->r_offset
3353 + input_section->output_section->vma
3354 + input_section->output_offset;
3355 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3356 sreloc = elf_section_data (input_section)->sreloc;
3357 if (sreloc == NULL)
3358 abort ();
3359 loc = sreloc->contents;
3360 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3361 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3362 }
3363 /* Fall through */
3364
3365 case R_386_TLS_GD:
3366 case R_386_TLS_GOTDESC:
3367 case R_386_TLS_DESC_CALL:
3368 case R_386_TLS_IE_32:
3369 case R_386_TLS_GOTIE:
3370 tls_type = GOT_UNKNOWN;
3371 if (h == NULL && local_got_offsets)
3372 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3373 else if (h != NULL)
3374 tls_type = elf_i386_hash_entry(h)->tls_type;
3375 if (tls_type == GOT_TLS_IE)
3376 tls_type = GOT_TLS_IE_NEG;
3377
3378 if (! elf_i386_tls_transition (info, input_bfd,
3379 input_section, contents,
3380 symtab_hdr, sym_hashes,
3381 &r_type, tls_type, rel,
3382 relend, h))
3383 return FALSE;
3384
3385 if (r_type == R_386_TLS_LE_32)
3386 {
3387 BFD_ASSERT (! unresolved_reloc);
3388 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3389 {
3390 unsigned int type;
3391 bfd_vma roff;
3392
3393 /* GD->LE transition. */
3394 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3395 if (type == 0x04)
3396 {
3397 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3398 Change it into:
3399 movl %gs:0, %eax; subl $foo@tpoff, %eax
3400 (6 byte form of subl). */
3401 memcpy (contents + rel->r_offset - 3,
3402 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3403 roff = rel->r_offset + 5;
3404 }
3405 else
3406 {
3407 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3408 Change it into:
3409 movl %gs:0, %eax; subl $foo@tpoff, %eax
3410 (6 byte form of subl). */
3411 memcpy (contents + rel->r_offset - 2,
3412 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3413 roff = rel->r_offset + 6;
3414 }
3415 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3416 contents + roff);
3417 /* Skip R_386_PC32/R_386_PLT32. */
3418 rel++;
3419 continue;
3420 }
3421 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3422 {
3423 /* GDesc -> LE transition.
3424 It's originally something like:
3425 leal x@tlsdesc(%ebx), %eax
3426
3427 leal x@ntpoff, %eax
3428
3429 Registers other than %eax may be set up here. */
3430
3431 unsigned int val;
3432 bfd_vma roff;
3433
3434 roff = rel->r_offset;
3435 val = bfd_get_8 (input_bfd, contents + roff - 1);
3436
3437 /* Now modify the instruction as appropriate. */
3438 /* aoliva FIXME: remove the above and xor the byte
3439 below with 0x86. */
3440 bfd_put_8 (output_bfd, val ^ 0x86,
3441 contents + roff - 1);
3442 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3443 contents + roff);
3444 continue;
3445 }
3446 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3447 {
3448 /* GDesc -> LE transition.
3449 It's originally:
3450 call *(%eax)
3451 Turn it into:
3452 xchg %ax,%ax */
3453
3454 bfd_vma roff;
3455
3456 roff = rel->r_offset;
3457 bfd_put_8 (output_bfd, 0x66, contents + roff);
3458 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3459 continue;
3460 }
3461 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3462 {
3463 unsigned int val;
3464
3465 /* IE->LE transition:
3466 Originally it can be one of:
3467 movl foo, %eax
3468 movl foo, %reg
3469 addl foo, %reg
3470 We change it into:
3471 movl $foo, %eax
3472 movl $foo, %reg
3473 addl $foo, %reg. */
3474 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3475 if (val == 0xa1)
3476 {
3477 /* movl foo, %eax. */
3478 bfd_put_8 (output_bfd, 0xb8,
3479 contents + rel->r_offset - 1);
3480 }
3481 else
3482 {
3483 unsigned int type;
3484
3485 type = bfd_get_8 (input_bfd,
3486 contents + rel->r_offset - 2);
3487 switch (type)
3488 {
3489 case 0x8b:
3490 /* movl */
3491 bfd_put_8 (output_bfd, 0xc7,
3492 contents + rel->r_offset - 2);
3493 bfd_put_8 (output_bfd,
3494 0xc0 | ((val >> 3) & 7),
3495 contents + rel->r_offset - 1);
3496 break;
3497 case 0x03:
3498 /* addl */
3499 bfd_put_8 (output_bfd, 0x81,
3500 contents + rel->r_offset - 2);
3501 bfd_put_8 (output_bfd,
3502 0xc0 | ((val >> 3) & 7),
3503 contents + rel->r_offset - 1);
3504 break;
3505 default:
3506 BFD_FAIL ();
3507 break;
3508 }
3509 }
3510 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3511 contents + rel->r_offset);
3512 continue;
3513 }
3514 else
3515 {
3516 unsigned int val, type;
3517
3518 /* {IE_32,GOTIE}->LE transition:
3519 Originally it can be one of:
3520 subl foo(%reg1), %reg2
3521 movl foo(%reg1), %reg2
3522 addl foo(%reg1), %reg2
3523 We change it into:
3524 subl $foo, %reg2
3525 movl $foo, %reg2 (6 byte form)
3526 addl $foo, %reg2. */
3527 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3528 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3529 if (type == 0x8b)
3530 {
3531 /* movl */
3532 bfd_put_8 (output_bfd, 0xc7,
3533 contents + rel->r_offset - 2);
3534 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3535 contents + rel->r_offset - 1);
3536 }
3537 else if (type == 0x2b)
3538 {
3539 /* subl */
3540 bfd_put_8 (output_bfd, 0x81,
3541 contents + rel->r_offset - 2);
3542 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3543 contents + rel->r_offset - 1);
3544 }
3545 else if (type == 0x03)
3546 {
3547 /* addl */
3548 bfd_put_8 (output_bfd, 0x81,
3549 contents + rel->r_offset - 2);
3550 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3551 contents + rel->r_offset - 1);
3552 }
3553 else
3554 BFD_FAIL ();
3555 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3556 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3557 contents + rel->r_offset);
3558 else
3559 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3560 contents + rel->r_offset);
3561 continue;
3562 }
3563 }
3564
3565 if (htab->elf.sgot == NULL)
3566 abort ();
3567
3568 if (h != NULL)
3569 {
3570 off = h->got.offset;
3571 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3572 }
3573 else
3574 {
3575 if (local_got_offsets == NULL)
3576 abort ();
3577
3578 off = local_got_offsets[r_symndx];
3579 offplt = local_tlsdesc_gotents[r_symndx];
3580 }
3581
3582 if ((off & 1) != 0)
3583 off &= ~1;
3584 else
3585 {
3586 Elf_Internal_Rela outrel;
3587 bfd_byte *loc;
3588 int dr_type, indx;
3589 asection *sreloc;
3590
3591 if (htab->elf.srelgot == NULL)
3592 abort ();
3593
3594 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3595
3596 if (GOT_TLS_GDESC_P (tls_type))
3597 {
3598 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3599 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3600 <= htab->elf.sgotplt->size);
3601 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3602 + htab->elf.sgotplt->output_offset
3603 + offplt
3604 + htab->sgotplt_jump_table_size);
3605 sreloc = htab->elf.srelplt;
3606 loc = sreloc->contents;
3607 loc += (htab->next_tls_desc_index++
3608 * sizeof (Elf32_External_Rel));
3609 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3610 <= sreloc->contents + sreloc->size);
3611 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3612 if (indx == 0)
3613 {
3614 BFD_ASSERT (! unresolved_reloc);
3615 bfd_put_32 (output_bfd,
3616 relocation - elf_i386_dtpoff_base (info),
3617 htab->elf.sgotplt->contents + offplt
3618 + htab->sgotplt_jump_table_size + 4);
3619 }
3620 else
3621 {
3622 bfd_put_32 (output_bfd, 0,
3623 htab->elf.sgotplt->contents + offplt
3624 + htab->sgotplt_jump_table_size + 4);
3625 }
3626 }
3627
3628 sreloc = htab->elf.srelgot;
3629
3630 outrel.r_offset = (htab->elf.sgot->output_section->vma
3631 + htab->elf.sgot->output_offset + off);
3632
3633 if (GOT_TLS_GD_P (tls_type))
3634 dr_type = R_386_TLS_DTPMOD32;
3635 else if (GOT_TLS_GDESC_P (tls_type))
3636 goto dr_done;
3637 else if (tls_type == GOT_TLS_IE_POS)
3638 dr_type = R_386_TLS_TPOFF;
3639 else
3640 dr_type = R_386_TLS_TPOFF32;
3641
3642 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3643 bfd_put_32 (output_bfd,
3644 relocation - elf_i386_dtpoff_base (info),
3645 htab->elf.sgot->contents + off);
3646 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3647 bfd_put_32 (output_bfd,
3648 elf_i386_dtpoff_base (info) - relocation,
3649 htab->elf.sgot->contents + off);
3650 else if (dr_type != R_386_TLS_DESC)
3651 bfd_put_32 (output_bfd, 0,
3652 htab->elf.sgot->contents + off);
3653 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3654
3655 loc = sreloc->contents;
3656 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3657 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3658 <= sreloc->contents + sreloc->size);
3659 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3660
3661 if (GOT_TLS_GD_P (tls_type))
3662 {
3663 if (indx == 0)
3664 {
3665 BFD_ASSERT (! unresolved_reloc);
3666 bfd_put_32 (output_bfd,
3667 relocation - elf_i386_dtpoff_base (info),
3668 htab->elf.sgot->contents + off + 4);
3669 }
3670 else
3671 {
3672 bfd_put_32 (output_bfd, 0,
3673 htab->elf.sgot->contents + off + 4);
3674 outrel.r_info = ELF32_R_INFO (indx,
3675 R_386_TLS_DTPOFF32);
3676 outrel.r_offset += 4;
3677 sreloc->reloc_count++;
3678 loc += sizeof (Elf32_External_Rel);
3679 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3680 <= sreloc->contents + sreloc->size);
3681 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3682 }
3683 }
3684 else if (tls_type == GOT_TLS_IE_BOTH)
3685 {
3686 bfd_put_32 (output_bfd,
3687 (indx == 0
3688 ? relocation - elf_i386_dtpoff_base (info)
3689 : 0),
3690 htab->elf.sgot->contents + off + 4);
3691 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3692 outrel.r_offset += 4;
3693 sreloc->reloc_count++;
3694 loc += sizeof (Elf32_External_Rel);
3695 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3696 }
3697
3698 dr_done:
3699 if (h != NULL)
3700 h->got.offset |= 1;
3701 else
3702 local_got_offsets[r_symndx] |= 1;
3703 }
3704
3705 if (off >= (bfd_vma) -2
3706 && ! GOT_TLS_GDESC_P (tls_type))
3707 abort ();
3708 if (r_type == R_386_TLS_GOTDESC
3709 || r_type == R_386_TLS_DESC_CALL)
3710 {
3711 relocation = htab->sgotplt_jump_table_size + offplt;
3712 unresolved_reloc = FALSE;
3713 }
3714 else if (r_type == ELF32_R_TYPE (rel->r_info))
3715 {
3716 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3717 + htab->elf.sgotplt->output_offset;
3718 relocation = htab->elf.sgot->output_section->vma
3719 + htab->elf.sgot->output_offset + off - g_o_t;
3720 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3721 && tls_type == GOT_TLS_IE_BOTH)
3722 relocation += 4;
3723 if (r_type == R_386_TLS_IE)
3724 relocation += g_o_t;
3725 unresolved_reloc = FALSE;
3726 }
3727 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3728 {
3729 unsigned int val, type;
3730 bfd_vma roff;
3731
3732 /* GD->IE transition. */
3733 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3734 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3735 if (type == 0x04)
3736 {
3737 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3738 Change it into:
3739 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3740 val >>= 3;
3741 roff = rel->r_offset - 3;
3742 }
3743 else
3744 {
3745 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3746 Change it into:
3747 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3748 roff = rel->r_offset - 2;
3749 }
3750 memcpy (contents + roff,
3751 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3752 contents[roff + 7] = 0x80 | (val & 7);
3753 /* If foo is used only with foo@gotntpoff(%reg) and
3754 foo@indntpoff, but not with foo@gottpoff(%reg), change
3755 subl $foo@gottpoff(%reg), %eax
3756 into:
3757 addl $foo@gotntpoff(%reg), %eax. */
3758 if (tls_type == GOT_TLS_IE_POS)
3759 contents[roff + 6] = 0x03;
3760 bfd_put_32 (output_bfd,
3761 htab->elf.sgot->output_section->vma
3762 + htab->elf.sgot->output_offset + off
3763 - htab->elf.sgotplt->output_section->vma
3764 - htab->elf.sgotplt->output_offset,
3765 contents + roff + 8);
3766 /* Skip R_386_PLT32. */
3767 rel++;
3768 continue;
3769 }
3770 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3771 {
3772 /* GDesc -> IE transition.
3773 It's originally something like:
3774 leal x@tlsdesc(%ebx), %eax
3775
3776 Change it to:
3777 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3778 or:
3779 movl x@gottpoff(%ebx), %eax # before negl %eax
3780
3781 Registers other than %eax may be set up here. */
3782
3783 bfd_vma roff;
3784
3785 /* First, make sure it's a leal adding ebx to a 32-bit
3786 offset into any register, although it's probably
3787 almost always going to be eax. */
3788 roff = rel->r_offset;
3789
3790 /* Now modify the instruction as appropriate. */
3791 /* To turn a leal into a movl in the form we use it, it
3792 suffices to change the first byte from 0x8d to 0x8b.
3793 aoliva FIXME: should we decide to keep the leal, all
3794 we have to do is remove the statement below, and
3795 adjust the relaxation of R_386_TLS_DESC_CALL. */
3796 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3797
3798 if (tls_type == GOT_TLS_IE_BOTH)
3799 off += 4;
3800
3801 bfd_put_32 (output_bfd,
3802 htab->elf.sgot->output_section->vma
3803 + htab->elf.sgot->output_offset + off
3804 - htab->elf.sgotplt->output_section->vma
3805 - htab->elf.sgotplt->output_offset,
3806 contents + roff);
3807 continue;
3808 }
3809 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3810 {
3811 /* GDesc -> IE transition.
3812 It's originally:
3813 call *(%eax)
3814
3815 Change it to:
3816 xchg %ax,%ax
3817 or
3818 negl %eax
3819 depending on how we transformed the TLS_GOTDESC above.
3820 */
3821
3822 bfd_vma roff;
3823
3824 roff = rel->r_offset;
3825
3826 /* Now modify the instruction as appropriate. */
3827 if (tls_type != GOT_TLS_IE_NEG)
3828 {
3829 /* xchg %ax,%ax */
3830 bfd_put_8 (output_bfd, 0x66, contents + roff);
3831 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3832 }
3833 else
3834 {
3835 /* negl %eax */
3836 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3837 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3838 }
3839
3840 continue;
3841 }
3842 else
3843 BFD_ASSERT (FALSE);
3844 break;
3845
3846 case R_386_TLS_LDM:
3847 if (! elf_i386_tls_transition (info, input_bfd,
3848 input_section, contents,
3849 symtab_hdr, sym_hashes,
3850 &r_type, GOT_UNKNOWN, rel,
3851 relend, h))
3852 return FALSE;
3853
3854 if (r_type != R_386_TLS_LDM)
3855 {
3856 /* LD->LE transition:
3857 leal foo(%reg), %eax; call ___tls_get_addr.
3858 We change it into:
3859 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
3860 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3861 memcpy (contents + rel->r_offset - 2,
3862 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3863 /* Skip R_386_PC32/R_386_PLT32. */
3864 rel++;
3865 continue;
3866 }
3867
3868 if (htab->elf.sgot == NULL)
3869 abort ();
3870
3871 off = htab->tls_ldm_got.offset;
3872 if (off & 1)
3873 off &= ~1;
3874 else
3875 {
3876 Elf_Internal_Rela outrel;
3877 bfd_byte *loc;
3878
3879 if (htab->elf.srelgot == NULL)
3880 abort ();
3881
3882 outrel.r_offset = (htab->elf.sgot->output_section->vma
3883 + htab->elf.sgot->output_offset + off);
3884
3885 bfd_put_32 (output_bfd, 0,
3886 htab->elf.sgot->contents + off);
3887 bfd_put_32 (output_bfd, 0,
3888 htab->elf.sgot->contents + off + 4);
3889 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3890 loc = htab->elf.srelgot->contents;
3891 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3892 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3893 htab->tls_ldm_got.offset |= 1;
3894 }
3895 relocation = htab->elf.sgot->output_section->vma
3896 + htab->elf.sgot->output_offset + off
3897 - htab->elf.sgotplt->output_section->vma
3898 - htab->elf.sgotplt->output_offset;
3899 unresolved_reloc = FALSE;
3900 break;
3901
3902 case R_386_TLS_LDO_32:
3903 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3904 relocation -= elf_i386_dtpoff_base (info);
3905 else
3906 /* When converting LDO to LE, we must negate. */
3907 relocation = -elf_i386_tpoff (info, relocation);
3908 break;
3909
3910 case R_386_TLS_LE_32:
3911 case R_386_TLS_LE:
3912 if (info->shared)
3913 {
3914 Elf_Internal_Rela outrel;
3915 asection *sreloc;
3916 bfd_byte *loc;
3917 int indx;
3918
3919 outrel.r_offset = rel->r_offset
3920 + input_section->output_section->vma
3921 + input_section->output_offset;
3922 if (h != NULL && h->dynindx != -1)
3923 indx = h->dynindx;
3924 else
3925 indx = 0;
3926 if (r_type == R_386_TLS_LE_32)
3927 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3928 else
3929 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3930 sreloc = elf_section_data (input_section)->sreloc;
3931 if (sreloc == NULL)
3932 abort ();
3933 loc = sreloc->contents;
3934 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3935 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3936 if (indx)
3937 continue;
3938 else if (r_type == R_386_TLS_LE_32)
3939 relocation = elf_i386_dtpoff_base (info) - relocation;
3940 else
3941 relocation -= elf_i386_dtpoff_base (info);
3942 }
3943 else if (r_type == R_386_TLS_LE_32)
3944 relocation = elf_i386_tpoff (info, relocation);
3945 else
3946 relocation = -elf_i386_tpoff (info, relocation);
3947 break;
3948
3949 default:
3950 break;
3951 }
3952
3953 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3954 because such sections are not SEC_ALLOC and thus ld.so will
3955 not process them. */
3956 if (unresolved_reloc
3957 && !((input_section->flags & SEC_DEBUGGING) != 0
3958 && h->def_dynamic))
3959 {
3960 (*_bfd_error_handler)
3961 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3962 input_bfd,
3963 input_section,
3964 (long) rel->r_offset,
3965 howto->name,
3966 h->root.root.string);
3967 return FALSE;
3968 }
3969
3970 do_relocation:
3971 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3972 contents, rel->r_offset,
3973 relocation, 0);
3974
3975 if (r != bfd_reloc_ok)
3976 {
3977 const char *name;
3978
3979 if (h != NULL)
3980 name = h->root.root.string;
3981 else
3982 {
3983 name = bfd_elf_string_from_elf_section (input_bfd,
3984 symtab_hdr->sh_link,
3985 sym->st_name);
3986 if (name == NULL)
3987 return FALSE;
3988 if (*name == '\0')
3989 name = bfd_section_name (input_bfd, sec);
3990 }
3991
3992 if (r == bfd_reloc_overflow)
3993 {
3994 if (! ((*info->callbacks->reloc_overflow)
3995 (info, (h ? &h->root : NULL), name, howto->name,
3996 (bfd_vma) 0, input_bfd, input_section,
3997 rel->r_offset)))
3998 return FALSE;
3999 }
4000 else
4001 {
4002 (*_bfd_error_handler)
4003 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4004 input_bfd, input_section,
4005 (long) rel->r_offset, name, (int) r);
4006 return FALSE;
4007 }
4008 }
4009 }
4010
4011 return TRUE;
4012 }
4013
4014 /* Finish up dynamic symbol handling. We set the contents of various
4015 dynamic sections here. */
4016
4017 static bfd_boolean
4018 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4019 struct bfd_link_info *info,
4020 struct elf_link_hash_entry *h,
4021 Elf_Internal_Sym *sym)
4022 {
4023 struct elf_i386_link_hash_table *htab;
4024
4025 htab = elf_i386_hash_table (info);
4026
4027 if (h->plt.offset != (bfd_vma) -1)
4028 {
4029 bfd_vma plt_index;
4030 bfd_vma got_offset;
4031 Elf_Internal_Rela rel;
4032 bfd_byte *loc;
4033 asection *plt, *gotplt, *relplt;
4034
4035 /* When building a static executable, use .iplt, .igot.plt and
4036 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4037 if (htab->elf.splt != NULL)
4038 {
4039 plt = htab->elf.splt;
4040 gotplt = htab->elf.sgotplt;
4041 relplt = htab->elf.srelplt;
4042 }
4043 else
4044 {
4045 plt = htab->elf.iplt;
4046 gotplt = htab->elf.igotplt;
4047 relplt = htab->elf.irelplt;
4048 }
4049
4050 /* This symbol has an entry in the procedure linkage table. Set
4051 it up. */
4052
4053 if ((h->dynindx == -1
4054 && !((h->forced_local || info->executable)
4055 && h->def_regular
4056 && h->type == STT_GNU_IFUNC))
4057 || plt == NULL
4058 || gotplt == NULL
4059 || relplt == NULL)
4060 abort ();
4061
4062 /* Get the index in the procedure linkage table which
4063 corresponds to this symbol. This is the index of this symbol
4064 in all the symbols for which we are making plt entries. The
4065 first entry in the procedure linkage table is reserved.
4066
4067 Get the offset into the .got table of the entry that
4068 corresponds to this function. Each .got entry is 4 bytes.
4069 The first three are reserved.
4070
4071 For static executables, we don't reserve anything. */
4072
4073 if (plt == htab->elf.splt)
4074 {
4075 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
4076 got_offset = (plt_index + 3) * 4;
4077 }
4078 else
4079 {
4080 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
4081 got_offset = plt_index * 4;
4082 }
4083
4084 /* Fill in the entry in the procedure linkage table. */
4085 if (! info->shared)
4086 {
4087 memcpy (plt->contents + h->plt.offset, elf_i386_plt_entry,
4088 PLT_ENTRY_SIZE);
4089 bfd_put_32 (output_bfd,
4090 (gotplt->output_section->vma
4091 + gotplt->output_offset
4092 + got_offset),
4093 plt->contents + h->plt.offset + 2);
4094
4095 if (htab->is_vxworks)
4096 {
4097 int s, k, reloc_index;
4098
4099 /* Create the R_386_32 relocation referencing the GOT
4100 for this PLT entry. */
4101
4102 /* S: Current slot number (zero-based). */
4103 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
4104 /* K: Number of relocations for PLTResolve. */
4105 if (info->shared)
4106 k = PLTRESOLVE_RELOCS_SHLIB;
4107 else
4108 k = PLTRESOLVE_RELOCS;
4109 /* Skip the PLTresolve relocations, and the relocations for
4110 the other PLT slots. */
4111 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4112 loc = (htab->srelplt2->contents + reloc_index
4113 * sizeof (Elf32_External_Rel));
4114
4115 rel.r_offset = (htab->elf.splt->output_section->vma
4116 + htab->elf.splt->output_offset
4117 + h->plt.offset + 2),
4118 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4119 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4120
4121 /* Create the R_386_32 relocation referencing the beginning of
4122 the PLT for this GOT entry. */
4123 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4124 + htab->elf.sgotplt->output_offset
4125 + got_offset);
4126 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4127 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4128 loc + sizeof (Elf32_External_Rel));
4129 }
4130 }
4131 else
4132 {
4133 memcpy (plt->contents + h->plt.offset, elf_i386_pic_plt_entry,
4134 PLT_ENTRY_SIZE);
4135 bfd_put_32 (output_bfd, got_offset,
4136 plt->contents + h->plt.offset + 2);
4137 }
4138
4139 /* Don't fill PLT entry for static executables. */
4140 if (plt == htab->elf.splt)
4141 {
4142 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4143 plt->contents + h->plt.offset + 7);
4144 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
4145 plt->contents + h->plt.offset + 12);
4146 }
4147
4148 /* Fill in the entry in the global offset table. */
4149 bfd_put_32 (output_bfd,
4150 (plt->output_section->vma
4151 + plt->output_offset
4152 + h->plt.offset
4153 + 6),
4154 gotplt->contents + got_offset);
4155
4156 /* Fill in the entry in the .rel.plt section. */
4157 rel.r_offset = (gotplt->output_section->vma
4158 + gotplt->output_offset
4159 + got_offset);
4160 if (h->dynindx == -1
4161 || ((info->executable
4162 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4163 && h->def_regular
4164 && h->type == STT_GNU_IFUNC))
4165 {
4166 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4167 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4168 in the .got.plt section. */
4169 bfd_put_32 (output_bfd,
4170 (h->root.u.def.value
4171 + h->root.u.def.section->output_section->vma
4172 + h->root.u.def.section->output_offset),
4173 gotplt->contents + got_offset);
4174 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4175 }
4176 else
4177 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4178 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4179 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4180
4181 if (!h->def_regular)
4182 {
4183 /* Mark the symbol as undefined, rather than as defined in
4184 the .plt section. Leave the value if there were any
4185 relocations where pointer equality matters (this is a clue
4186 for the dynamic linker, to make function pointer
4187 comparisons work between an application and shared
4188 library), otherwise set it to zero. If a function is only
4189 called from a binary, there is no need to slow down
4190 shared libraries because of that. */
4191 sym->st_shndx = SHN_UNDEF;
4192 if (!h->pointer_equality_needed)
4193 sym->st_value = 0;
4194 }
4195 }
4196
4197 if (h->got.offset != (bfd_vma) -1
4198 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4199 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4200 {
4201 Elf_Internal_Rela rel;
4202 bfd_byte *loc;
4203
4204 /* This symbol has an entry in the global offset table. Set it
4205 up. */
4206
4207 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4208 abort ();
4209
4210 rel.r_offset = (htab->elf.sgot->output_section->vma
4211 + htab->elf.sgot->output_offset
4212 + (h->got.offset & ~(bfd_vma) 1));
4213
4214 /* If this is a static link, or it is a -Bsymbolic link and the
4215 symbol is defined locally or was forced to be local because
4216 of a version file, we just want to emit a RELATIVE reloc.
4217 The entry in the global offset table will already have been
4218 initialized in the relocate_section function. */
4219 if (h->def_regular
4220 && h->type == STT_GNU_IFUNC)
4221 {
4222 if (info->shared)
4223 {
4224 /* Generate R_386_GLOB_DAT. */
4225 goto do_glob_dat;
4226 }
4227 else
4228 {
4229 if (!h->pointer_equality_needed)
4230 abort ();
4231
4232 /* For non-shared object, we can't use .got.plt, which
4233 contains the real function addres if we need pointer
4234 equality. We load the GOT entry with the PLT entry. */
4235 asection *plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4236 bfd_put_32 (output_bfd,
4237 (plt->output_section->vma
4238 + plt->output_offset + h->plt.offset),
4239 htab->elf.sgot->contents + h->got.offset);
4240 return TRUE;
4241 }
4242 }
4243 else if (info->shared
4244 && SYMBOL_REFERENCES_LOCAL (info, h))
4245 {
4246 BFD_ASSERT((h->got.offset & 1) != 0);
4247 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4248 }
4249 else
4250 {
4251 BFD_ASSERT((h->got.offset & 1) == 0);
4252 do_glob_dat:
4253 bfd_put_32 (output_bfd, (bfd_vma) 0,
4254 htab->elf.sgot->contents + h->got.offset);
4255 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4256 }
4257
4258 loc = htab->elf.srelgot->contents;
4259 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4260 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4261 }
4262
4263 if (h->needs_copy)
4264 {
4265 Elf_Internal_Rela rel;
4266 bfd_byte *loc;
4267
4268 /* This symbol needs a copy reloc. Set it up. */
4269
4270 if (h->dynindx == -1
4271 || (h->root.type != bfd_link_hash_defined
4272 && h->root.type != bfd_link_hash_defweak)
4273 || htab->srelbss == NULL)
4274 abort ();
4275
4276 rel.r_offset = (h->root.u.def.value
4277 + h->root.u.def.section->output_section->vma
4278 + h->root.u.def.section->output_offset);
4279 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4280 loc = htab->srelbss->contents;
4281 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
4282 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4283 }
4284
4285 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4286 be NULL for local symbols.
4287
4288 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
4289 is relative to the ".got" section. */
4290 if (sym != NULL
4291 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
4292 || (!htab->is_vxworks && h == htab->elf.hgot)))
4293 sym->st_shndx = SHN_ABS;
4294
4295 return TRUE;
4296 }
4297
4298 /* Finish up local dynamic symbol handling. We set the contents of
4299 various dynamic sections here. */
4300
4301 static bfd_boolean
4302 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4303 {
4304 struct elf_link_hash_entry *h
4305 = (struct elf_link_hash_entry *) *slot;
4306 struct bfd_link_info *info
4307 = (struct bfd_link_info *) inf;
4308
4309 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4310 h, NULL);
4311 }
4312
4313 /* Used to decide how to sort relocs in an optimal manner for the
4314 dynamic linker, before writing them out. */
4315
4316 static enum elf_reloc_type_class
4317 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4318 {
4319 switch (ELF32_R_TYPE (rela->r_info))
4320 {
4321 case R_386_RELATIVE:
4322 return reloc_class_relative;
4323 case R_386_JUMP_SLOT:
4324 return reloc_class_plt;
4325 case R_386_COPY:
4326 return reloc_class_copy;
4327 default:
4328 return reloc_class_normal;
4329 }
4330 }
4331
4332 /* Finish up the dynamic sections. */
4333
4334 static bfd_boolean
4335 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4336 struct bfd_link_info *info)
4337 {
4338 struct elf_i386_link_hash_table *htab;
4339 bfd *dynobj;
4340 asection *sdyn;
4341
4342 htab = elf_i386_hash_table (info);
4343 dynobj = htab->elf.dynobj;
4344 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4345
4346 if (htab->elf.dynamic_sections_created)
4347 {
4348 Elf32_External_Dyn *dyncon, *dynconend;
4349
4350 if (sdyn == NULL || htab->elf.sgot == NULL)
4351 abort ();
4352
4353 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4354 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4355 for (; dyncon < dynconend; dyncon++)
4356 {
4357 Elf_Internal_Dyn dyn;
4358 asection *s;
4359
4360 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4361
4362 switch (dyn.d_tag)
4363 {
4364 default:
4365 if (htab->is_vxworks
4366 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4367 break;
4368 continue;
4369
4370 case DT_PLTGOT:
4371 s = htab->elf.sgotplt;
4372 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4373 break;
4374
4375 case DT_JMPREL:
4376 s = htab->elf.srelplt;
4377 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4378 break;
4379
4380 case DT_PLTRELSZ:
4381 s = htab->elf.srelplt;
4382 dyn.d_un.d_val = s->size;
4383 break;
4384
4385 case DT_RELSZ:
4386 /* My reading of the SVR4 ABI indicates that the
4387 procedure linkage table relocs (DT_JMPREL) should be
4388 included in the overall relocs (DT_REL). This is
4389 what Solaris does. However, UnixWare can not handle
4390 that case. Therefore, we override the DT_RELSZ entry
4391 here to make it not include the JMPREL relocs. */
4392 s = htab->elf.srelplt;
4393 if (s == NULL)
4394 continue;
4395 dyn.d_un.d_val -= s->size;
4396 break;
4397
4398 case DT_REL:
4399 /* We may not be using the standard ELF linker script.
4400 If .rel.plt is the first .rel section, we adjust
4401 DT_REL to not include it. */
4402 s = htab->elf.srelplt;
4403 if (s == NULL)
4404 continue;
4405 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4406 continue;
4407 dyn.d_un.d_ptr += s->size;
4408 break;
4409 }
4410
4411 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4412 }
4413
4414 /* Fill in the first entry in the procedure linkage table. */
4415 if (htab->elf.splt && htab->elf.splt->size > 0)
4416 {
4417 if (info->shared)
4418 {
4419 memcpy (htab->elf.splt->contents, elf_i386_pic_plt0_entry,
4420 sizeof (elf_i386_pic_plt0_entry));
4421 memset (htab->elf.splt->contents + sizeof (elf_i386_pic_plt0_entry),
4422 htab->plt0_pad_byte,
4423 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
4424 }
4425 else
4426 {
4427 memcpy (htab->elf.splt->contents, elf_i386_plt0_entry,
4428 sizeof(elf_i386_plt0_entry));
4429 memset (htab->elf.splt->contents + sizeof (elf_i386_plt0_entry),
4430 htab->plt0_pad_byte,
4431 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
4432 bfd_put_32 (output_bfd,
4433 (htab->elf.sgotplt->output_section->vma
4434 + htab->elf.sgotplt->output_offset
4435 + 4),
4436 htab->elf.splt->contents + 2);
4437 bfd_put_32 (output_bfd,
4438 (htab->elf.sgotplt->output_section->vma
4439 + htab->elf.sgotplt->output_offset
4440 + 8),
4441 htab->elf.splt->contents + 8);
4442
4443 if (htab->is_vxworks)
4444 {
4445 Elf_Internal_Rela rel;
4446
4447 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4448 On IA32 we use REL relocations so the addend goes in
4449 the PLT directly. */
4450 rel.r_offset = (htab->elf.splt->output_section->vma
4451 + htab->elf.splt->output_offset
4452 + 2);
4453 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4454 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4455 htab->srelplt2->contents);
4456 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4457 rel.r_offset = (htab->elf.splt->output_section->vma
4458 + htab->elf.splt->output_offset
4459 + 8);
4460 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4461 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4462 htab->srelplt2->contents +
4463 sizeof (Elf32_External_Rel));
4464 }
4465 }
4466
4467 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4468 really seem like the right value. */
4469 elf_section_data (htab->elf.splt->output_section)
4470 ->this_hdr.sh_entsize = 4;
4471
4472 /* Correct the .rel.plt.unloaded relocations. */
4473 if (htab->is_vxworks && !info->shared)
4474 {
4475 int num_plts = (htab->elf.splt->size / PLT_ENTRY_SIZE) - 1;
4476 unsigned char *p;
4477
4478 p = htab->srelplt2->contents;
4479 if (info->shared)
4480 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4481 else
4482 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4483
4484 for (; num_plts; num_plts--)
4485 {
4486 Elf_Internal_Rela rel;
4487 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4488 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4489 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4490 p += sizeof (Elf32_External_Rel);
4491
4492 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4493 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4494 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4495 p += sizeof (Elf32_External_Rel);
4496 }
4497 }
4498 }
4499 }
4500
4501 if (htab->elf.sgotplt)
4502 {
4503 /* Fill in the first three entries in the global offset table. */
4504 if (htab->elf.sgotplt->size > 0)
4505 {
4506 bfd_put_32 (output_bfd,
4507 (sdyn == NULL ? 0
4508 : sdyn->output_section->vma + sdyn->output_offset),
4509 htab->elf.sgotplt->contents);
4510 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4511 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4512 }
4513
4514 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4515 }
4516
4517 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4518 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4519
4520 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4521 htab_traverse (htab->loc_hash_table,
4522 elf_i386_finish_local_dynamic_symbol,
4523 info);
4524
4525 return TRUE;
4526 }
4527
4528 /* Return address for Ith PLT stub in section PLT, for relocation REL
4529 or (bfd_vma) -1 if it should not be included. */
4530
4531 static bfd_vma
4532 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4533 const arelent *rel ATTRIBUTE_UNUSED)
4534 {
4535 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4536 }
4537
4538 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4539
4540 static bfd_boolean
4541 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4542 {
4543 if (h->plt.offset != (bfd_vma) -1
4544 && !h->def_regular
4545 && !h->pointer_equality_needed)
4546 return FALSE;
4547
4548 return _bfd_elf_hash_symbol (h);
4549 }
4550
4551 /* Hook called by the linker routine which adds symbols from an object
4552 file. */
4553
4554 static bfd_boolean
4555 elf_i386_add_symbol_hook (bfd * abfd ATTRIBUTE_UNUSED,
4556 struct bfd_link_info * info ATTRIBUTE_UNUSED,
4557 Elf_Internal_Sym * sym,
4558 const char ** namep ATTRIBUTE_UNUSED,
4559 flagword * flagsp ATTRIBUTE_UNUSED,
4560 asection ** secp ATTRIBUTE_UNUSED,
4561 bfd_vma * valp ATTRIBUTE_UNUSED)
4562 {
4563 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4564 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4565
4566 return TRUE;
4567 }
4568
4569 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4570 #define TARGET_LITTLE_NAME "elf32-i386"
4571 #define ELF_ARCH bfd_arch_i386
4572 #define ELF_MACHINE_CODE EM_386
4573 #define ELF_MAXPAGESIZE 0x1000
4574
4575 #define elf_backend_can_gc_sections 1
4576 #define elf_backend_can_refcount 1
4577 #define elf_backend_want_got_plt 1
4578 #define elf_backend_plt_readonly 1
4579 #define elf_backend_want_plt_sym 0
4580 #define elf_backend_got_header_size 12
4581
4582 /* Support RELA for objdump of prelink objects. */
4583 #define elf_info_to_howto elf_i386_info_to_howto_rel
4584 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4585
4586 #define bfd_elf32_mkobject elf_i386_mkobject
4587
4588 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4589 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4590 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
4591 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4592 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4593
4594 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4595 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4596 #define elf_backend_check_relocs elf_i386_check_relocs
4597 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4598 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4599 #define elf_backend_fake_sections elf_i386_fake_sections
4600 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4601 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4602 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4603 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4604 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4605 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4606 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4607 #define elf_backend_relocate_section elf_i386_relocate_section
4608 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4609 #define elf_backend_always_size_sections elf_i386_always_size_sections
4610 #define elf_backend_omit_section_dynsym \
4611 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4612 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4613 #define elf_backend_hash_symbol elf_i386_hash_symbol
4614 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
4615 #undef elf_backend_post_process_headers
4616 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4617
4618 #include "elf32-target.h"
4619
4620 /* FreeBSD support. */
4621
4622 #undef TARGET_LITTLE_SYM
4623 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4624 #undef TARGET_LITTLE_NAME
4625 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4626 #undef ELF_OSABI
4627 #define ELF_OSABI ELFOSABI_FREEBSD
4628
4629 /* The kernel recognizes executables as valid only if they carry a
4630 "FreeBSD" label in the ELF header. So we put this label on all
4631 executables and (for simplicity) also all other object files. */
4632
4633 static void
4634 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4635 {
4636 _bfd_elf_set_osabi (abfd, info);
4637
4638 #ifdef OLD_FREEBSD_ABI_LABEL
4639 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4640 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4641 #endif
4642 }
4643
4644 #undef elf_backend_post_process_headers
4645 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4646 #undef elf32_bed
4647 #define elf32_bed elf32_i386_fbsd_bed
4648
4649 #undef elf_backend_add_symbol_hook
4650
4651 #include "elf32-target.h"
4652
4653 /* VxWorks support. */
4654
4655 #undef TARGET_LITTLE_SYM
4656 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4657 #undef TARGET_LITTLE_NAME
4658 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4659 #undef ELF_OSABI
4660
4661 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4662
4663 static struct bfd_link_hash_table *
4664 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
4665 {
4666 struct bfd_link_hash_table *ret;
4667 struct elf_i386_link_hash_table *htab;
4668
4669 ret = elf_i386_link_hash_table_create (abfd);
4670 if (ret)
4671 {
4672 htab = (struct elf_i386_link_hash_table *) ret;
4673 htab->is_vxworks = 1;
4674 htab->plt0_pad_byte = 0x90;
4675 }
4676
4677 return ret;
4678 }
4679
4680
4681 #undef elf_backend_relocs_compatible
4682 #undef elf_backend_post_process_headers
4683 #undef bfd_elf32_bfd_link_hash_table_create
4684 #define bfd_elf32_bfd_link_hash_table_create \
4685 elf_i386_vxworks_link_hash_table_create
4686 #undef elf_backend_add_symbol_hook
4687 #define elf_backend_add_symbol_hook \
4688 elf_vxworks_add_symbol_hook
4689 #undef elf_backend_link_output_symbol_hook
4690 #define elf_backend_link_output_symbol_hook \
4691 elf_vxworks_link_output_symbol_hook
4692 #undef elf_backend_emit_relocs
4693 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4694 #undef elf_backend_final_write_processing
4695 #define elf_backend_final_write_processing \
4696 elf_vxworks_final_write_processing
4697
4698 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4699 define it. */
4700 #undef elf_backend_want_plt_sym
4701 #define elf_backend_want_plt_sym 1
4702
4703 #undef elf32_bed
4704 #define elf32_bed elf32_i386_vxworks_bed
4705
4706 #include "elf32-target.h"